You're the Problem! Stop using the Wrong Powder!

[@ozark_trapper]

I dont understand getting a magnum or a prc. And getting a 20 inch barrel. I want 24 or longer barrel. My new 280AI. Is a Browning Xbolt Speed Long Range 280AI. It has a 1@8 twist 26-inch barrel. I looked at the Savage Ultralight 280AI. But a 22 inch barrel. Wasnt what i was looking for. I wanted at least a 24-inch barrel. And i wanted a 1@8 twist barrel. Browning Xbolt offer that.

[@ajdube9967]

Because non Fudds out west use these things that screw onto the barrel to make the gun quieter. Using a shorter barrel then adding 6-7" onto the end of the barrel makes for a longer barrel. But if you take a shorter barrel with a modern cartridge and add these little make gun quieter things to the end then the length isn't so bad. You can make big boom quieter and only lose a little speed.

[@matalostodos]

Hahahahaha how can anyone be so wrong By that logic the US military would not be constantly struggling with their replacement of 30-06. “Big boom quieter and only lose a little speed” he says Oh, why do all the jihadis out there stick to their long barrel unsuppressed .312+ calibre rifles, poverty? And yet they conquer against armies armed with planes and navies

[@Dave-cf2ng]

Yeah. A 26” barrel with a 7” suppressor makes the gun unfortunately useless. Not carrying a 33” barreled rifle into the field

[@exothermal.sprocket]

@@ajdube9967 Soon as you pay the government for a right, along with registering your personal sensitive ID data like some criminal.. That's the bottom line. Fueling an alphabet agency that's been trying to end firearms in the USA, so you can have a little quieter shot.

[@jamesgray143]

Suppressor

[@rustypills1903]

This is by far the most honest video I have seen on this. Perfect explanation. When I had my custom 7 mm made, I handed the gunsmith a 7mm cartridge blank loaded to my desired COAL with my preferred bullet and said please throat it this length. I can shoot 168 gr pills at almost 3200 fps out of 28 inch barrel 1 in 8 twist. All the hype about the 7 prc only makes sense to factory ammo shooters. I have never even considered Sami spec info useful for custom guns. I have it build for intended use. You stated everything so well and backed up your point with data. This was a very well thought out and put together video. You clearly also feel the frustration from all the marketing and partially true information surrounding the 7 prc.

[@ReloadingWeatherby]

Thanks for watching and thanks for your comment!

[@bradleytyrrell4417]

I did the same thing when i built my 7mm rem mag got the throat length set where it should be and it hammers 7mmprc is in my opinion the same as yours mate it's for factory ammo shooters

[@LRRPFco52]

Wait until you see high-speed video of the projectile exiting the muzzle and all the unburnt powder flying out from legacy cartridges. Guess what that does to standard deviation? GRT is a theoretical internal ballistics model, not an actual pressure test breech with gauges over the powder column datum, or anywhere down-barrel.

[@LRRPFco52]

​@@bradleytyrrell4417 The whole purpose for 7PRC is to have tight SDs for long-range hunting, with longer high BC projectiles located correctly relative to the SNJ. For hunters who will only be shooting 300-400yds, it doesn't matter between 7mm Rem Mag or most other cartridges. They could use a 270, a .308, .30-06, 280, 25-06, any of the cartridges with long powder columns that spit a significant amount of the unburnt powder out the muzzle. After you pass the maximum ignitable propellant load, the remainder is acting as a filler and throat/bore eroder. Most 20th Century bottleneck rifle cartridge designs are terribly inefficient, and their propellant geometry was poorly conceived by dudes who didn't have access to high-speed photography or modern instrumentation, though their instrumentation was far better than most people know in the big brands.

[@TomL3grandsons]

One of your best videos yet.

[@ReloadingWeatherby]

Thanks Tom

[@andywilson5049]

I have a 7 rem mag that I have the 1 in 8 twist barrel with 150 thou extra free bore to take full advantage of this case. The 7 prc is a great round but not what the 7 rem mag can be with the correct barrel.

[@cheatinggravity173]

Yep that long freebor makes a huge difference since you can not only seat the bullet way out of the case but also provide for a large jump to the lands, which combined together really makes a difference in how much powder you can stuff in there without going over pressure. My .270 has a really long freebore and I am only seating the bullets about .250" into the case while also having about a .060" jump. I can get 58 grains of n560 in there, which gets me 2900 fps with a 170 gr bullet just before I start seeing pressure signs. I am positive I would not be able to get anywhere close to that without that freebore.

[@brettthompspon3182]

The 7 prc is just a more out of the box “turn key option” then the rem mag. If you’re building a gun it truely dosent matter but if you want to buy a factory gun or shoot factory ammo the 7 prc is the better round

[@LRRPFco52]

I love 7mm Rem Mag since I live out in the Rockies. It has been a staple cartridge out here for generations. The reason why guys started exploring beyond it with fatter cases is because of standard deviation, which really affects performance at distance. Temperature changes and erratic SD push the 7mm Rem Mag into ethical considerations as the distance shots come into play. We just can't justify breaking a shot at distance when the ES is 75-100fps. There is a lot of powder that exits the muzzle on all the long powder column legacy designs.

[@t_andin9343]

Love this format! I’d love to see a breakdown like this on 280 AI. It seems people run the gamut on powder burn rates in that cartridge. Anything from 6.5 staBall to Retumbo. One guy says you’re all using powders that are too slow, then five minutes later somebody says you guys are all using powders that are way too fast. Great Video!

[@ReloadingWeatherby]

Good idea!

[@RON-m8c]

I Agree! 🥳 ​@ReloadingWeatherby

[@thomasdaum1927]

The best powder is the one that you the best accuracy at the velocity you want !………

[@ReloadingWeatherby]

@@thomasdaum1927 I'm not forcing anyone to not use a powder they love. I'm just trying to help save time and money for that sweet spot load.

[@thomasdaum1927]

@@t_andin9343 I agree totally !..

[@orr89rocz]

Chasing velocity over accuracy can get expensive and frustrating lol

[@nmelkhunter1]

Well said. In most cases, it’s not worth it.

[@cdavison9491]

It's not chasing velocity over accuracy. It's finding the crossroads of both equally. Which is what reloading is all about.

[@orr89rocz]

@ the whole discussion in that video centered around max pressure max velocity loads.

[@thebryguy96]

I would agree that on long magnum cases, rarely are loads compressed when seating bullets into the case, but on short magnums like a saum, 223, 6 arc cartridges, many accurate and ideal powders are often compressed so bullet seating and bullet weights are much more critical. The 300 wby or 28 nosler are rarely compressed with proper powder selections. You provided good insight as usual. Too many reloaders are using h1000 when they should use h4831 and i see many using h4831 instead of h4350 for example in other cartidges. The slower powders are "safer" in that its harder to overfill the case by accident but they typically don’t work as well with short barrels as you state here and you cant get the velocity if the burn rate is too slow to properly fill the case. Regarding accuracy and bullet seating depth, builders and shooters like jim borden told me he prefers seating depths which dont take up too much internal case space, not for velocity as much as consistently with accuracy and powder burn. A 338 norma vs a 338 lapua is an example where the shorter 338 norma works better with the 300 smk and the longer 338 lapua case works a bit better with the 250 smk regarding case fills, etc. But oftentimes it takes benchrest shooters like borden to see noticeable differences in accuracy. 0.75 to 1 moa accuracy in a hunting gun is usually very good for most hunters so trying to go down rabbit holes usually wont produce more success under normal hunting conditions and ranges. It is more of a want than a need to chase 1/4 moa for practical applications. Thanks again for the video. It might be your best one yet. The GRT is very useful, and you proved it. You might consider making a tutorial video.

[@js7127]

What I really like about your videos is you not only document your findings but all the supporting information to boot as well as other channels findings. Thus providing the resources for us to make our own conclusions and load adjustments. Much appreciated Austin.

[@ReloadingWeatherby]

Thanks for watching

[@umbertoharo3841]

Barrel length matters . All this talk about long range hunting, target shooting you need velocity!!

[@shaunzimmerman661]

yes

[@shaunzimmerman661]

thats why mags and 220 swift 22 250 and 25 06 are always in at least a 24 in barrel!

[@BB-nw3mj]

thats what she said

[@glenoh88]

No way? Really? You mean a bullet doesn’t move without it? You need enough velocity for the range and bullet used. Shorter barrels can work - it depends on how far you shoot and type of bullet so it expands. What’s the point of a 26” barrel out of a 300 wby shooting a target at 50 yards?

[@edwardhoward4708]

@@glenoh88 in that case, what’s the point of the 300 mag?

[@chasehunt6497]

We talked about N570 in the 7PRC in a 22” barrel on your latest video about it. I just shot a one shot velocity ladder. I went from 70 grains to 73 in 0.5 increments. I was fully aware I’m in high territory and was monitoring every shot with the assumption I would be pulling some bullets. While I have no way of measuring pressure numerically, the only and I mean ONLY sign were slightly flattened primers, but they were no less flat than Hornady factory. There was ZERO bolt lift, or ejector mark/swipe, nor cratering (but some guns can crater even at low pressure). While it is 40 degrees today, I will most likely need to back down and will. But the velocities were 2984 and 3020 on the 72.5 and 73 grain charges respectively. And the load was something I would have no issues shooting in today’s weather. I did not deem it unsafe. But I need to test more. All in all, pretty good for a 22” barrel with 30 rounds down it. I probably won’t finish there. But I’m not throwing out N570 yet. This is also a hunting rifle, so I care less about brass life and barrel life and am comfortable with a bit of a “hot rod”. Great videos.

[@ReloadingWeatherby]

@@chasehunt6497 What bullet are you using?

[@chasehunt6497]

@@ReloadingWeatherby 175 eldx. Loaded to 3.36 OAL. That’s 20 thou off jam in my rifle. Keep in mind I’m not saying these rounds weren’t in the 66-68k range. I just got not see it whatsoever in the rifle or brass. I’m going to test further. I also fully acknowledge I may not get 100% burn, I’m going to run some SD ES testing to follow

[@ReloadingWeatherby]

@chasehunt6497 Give me a sec and I can tell you your ball park pressure. Modern brass is pretty incredible

[@quarterminutemagnums]

Good job, been trying to explain this to customers for years.........................Merry Christmas.

[@ReloadingWeatherby]

Merry Christmas!

[@montanamusings]

This is exactly what I've been trying to figure out for my 6.8 Western with a 20" barrel. Great video!

[@LRRPFco52]

You should have tight SDs with that cartridge using the right powder and bullet combos. 6.8 Western will be much tighter than 270 Win, which doesn't fully convert the powder column. What part of the Country are you in?

[@soupie31547]

Great video. Haven’t seen any IMR 7828 in Canada in a long time. Wish I could get my hands on some.

[@Scott-jj5on]

Try Bartons in Grande Prairie,they had some a bit ago.

[@soupie31547]

@ Thanks for the heads up! I will check them out.

[@CountGamelok]

284 shehane with a 30" barrel she been my favorite 7mm after getting her built. Seen wby and how they are slowly falling off in production hurts my heart, but good vid good info for folks out there,

[@ReloadingWeatherby]

Thanks for watching

[@drdes9609]

Great video 7prc doesn’t offer much over 7 rem mag. I think the 280AI will actually increase in popularity.

[@ReloadingWeatherby]

280 AI is very underrated.

[@RON-m8c]

​@@ReloadingWeatherbyI Agree! 👍

[@RON-m8c]

@ajdube9967 I've Owned Bigger Magnums and My "Big 30's" Will Outperform Any 7mm Cartridge! However, My Good Old 270 Winchester and 30-06 Haven't Let Me Down Yet! Did You Look At My Profile Picture? 😜 I Know How To Hunt! 😏

[@RON-m8c]

🤠 Now, in The Factory Loaded Ammunition, "Unknown Munitions" (Post Falls, Idaho) Lists The 270 Winchester With The 165 Grain Nosler ABLR at 2,925 ft/s and The 280AI With The 168 grain Nosler ABLR at 2,950 ft/s! Not Alot of Different, But I Would Love To See The Reloaded Potential Difference of These Two Cartridges? PLEASE? 🙏

[@exothermal.sprocket]

6.8 Western: good twist rate .270 Win: too slow twist rate That's always been the issue, that, and the lack of .277 low-drag projectiles by comparison to .264, .284, and .308.

[@thebryguy96]

I watched your video again as I only watched the first 1/2 earlier. The guy with Little crow made some very detailed vids as you mentioned and they are worth watching for people wanting to understand powder burn, bullets, barrel lengths, also. GRT tool helps confirm what I have seen and what you and he talked about. Have you considered doing a tutorial video on how to install it and how to make a profile. It is not difficult, but you seem to navigate it well and it would be useful to many. This video is probably one of your most useful and best vids to date. Barrel Length matters, especially with LA Magnums and slower powders, but too many reloaders are not using the ideal/most efficient powder as you noted here. Guys wanting to shoot short barreled "magnums" really need to stick with short/fat cartridges like a 7 Saum, 300 Saum, a 7mm Sherman Short or a 300 WSM with N550 or N560 Type powders. It is difficult to beat a 7mm with a 26 inch barrel; it is necessary to get the velocity and efficiency you speak of. My 7mm Rem and 300 wby improved are both 26".

[@LRRPFco52]

I'll take tight SDs over maximum incidental velocity with high ES any day, because both will do the same out to 400yds, but only 1 will deliver predictable impacts at distance. That's where 7 PRC comes into play with both tight SD and high mv.

[@TheWVgoodguy22]

Excellent breakdown of the attributes and powder choices that would be optimal for those two popular 7s for western hunters. I might have to figure this out for my 270 Win and 300 WSM. I do have H4831SC that I bought this year.

[@h.a.4286]

If you can get it ReloadSwiss RS60 for the 300 WSM. I love it.... 65fps advantage over N550 which is the first powder when the 300 WSM is brought up.

[@aaronwilcox6417]

Long before you were around there was an good powder back in the day H870. I am sure it's discontinued but it worked well in 7mm rem mag. I was thinking that a lot of the bullet seating depth and chamber issues would be an non issue if folks used single shot bolt actions. You can have the chamber and lead chambered anyway you desire as theres no magazine restrictions. Ive got a few and even for long distance hunting shooting its a beast.

[@zebacake4683]

Great video, i used this logic to push the 215 berger from the 30-06 to over 2750fps. In a 23" barrel.

[@RichB804]

Great job on this video. Very informative and detailed.

[@cheatinggravity173]

Lots of great info, thanks for touching on this subject. There's lots of misinformation out there about this subject- but specifically people say the shorter case gives more case capacity because it keeps the bullet from intruding into the powder column, and that's just flat wrong. They seem to conveniently forget about the powder up in the shoulder that's surrounding the bullet on the sides in the longer case. I proved this to myself 25 years ago with dummy rounds with drilled out primer pockers so that we could put them upside down and fill with water with a syringe and the bullet seated properly. This gave you *real* case capacity. The longer case always had more capacity than the shorter one, even when you had to seat the bullet deeper to stay at magazine length. I'm off to download grt momentarily...

[@ReloadingWeatherby]

Thanks for your comment

[@LRRPFco52]

That's all powder that doesn't get converted and just flies out the muzzle, after being blown across the leade and bore. Look at artillery shells some time and how they prime them.

[@RON-m8c]

🥳 Great Video Austin ("The Myth Buster")! Now, Go Ahead and Compare The 7mm prc (With That 22" Barrel) To The 280 AI (22" Barrel) and See What You Get? 😜 Is The Velocity Difference Worth Giving Up Extra Rounds in The Magazine? 🤷‍♂️

[@mosinw6697]

You are making me rethink the 7mm rem mag . Great video as always

[@LRRPFco52]

What region are you in, what type of game will you be shooting, and what distances?

[@dhooter]

H-1000 and Staball give me 7 mag velocities in my 280AI. I have yet to try 7828 but I just picked up two pounds of it. Cost me my youngest child plus 50 bucks and a kidney. 🤷🏼‍♂️

[@martinrichard-r1v]

Great video I am doing the groundwork for load development for 240 weatherby, 24 inch barrel shooting 115 grain dtac bullets any idea what speed the nodes may be at Crow gun works seems to be able to predict them Want to shoot 75 grain hammer bullets from the same rifle Really believe in monolithic bullets Started using Barnes in the 70's Any comments on switching back and forth from monolithic to cup and core bullets

[@ReloadingWeatherby]

I would download GRT and see what it says. I personally haven't seen any effect in accuracy switching between the two types of bullets.

[@ernstscholz3323]

Dear Martin Richard ,I own a couple 240Wby.shot a couple barrels out and thousands of rounds and game.If you haven't looked at your twist rate of your barrels try to figure that out first.I would say to get the best performence out of your 240Wby.don't go below a 26" barrel and try to get a 1:7.5 or 1:7,7 twist so ypu are sure your 115gr VLD bullets are also stabilised at sealevel.For culling I used the 87gr V-Max in a 1:10 26" bull barrel and it is just a tack driver and a lightening bolt.Good luck and be save!!

[@wesleyhargis5115]

I've never had it explained as it lowering potential velocity but that it impacts the burn rate as well as when and where the heat gets applied and can hurt accuracy

[@larciereZS]

Grate video. If you deep dive in topics like this, you should use GRT more comprehensively. With COL of 3.290" you assume the Bullet Jump is 0" and the projectile is touching the lands, that is why the Max. Pressure is 64,910psi. If you include the BJ variable, e.g. 0.100" distance to the lands, the pressure will be more realistic value of 61,967psi. Also, test the real bulk density of your batch of powder by dividing the Case Powder volume with the Case H2O volume x 1000. That will have an effect on the true Load Ratio, the powder true Isentropic Exponent and Combustion Coefficient variable after an OBT test and consequently with the tested real projectile velocity entered in the OBT test it will further give you more realistic Max. Pressure and cartridge performance.

[@justahologram2230]

I swear some people don't bother researching what compressing the charge can do to performance

[@ReloadingWeatherby]

Thanks for watching

[@ozark_trapper]

I fount some IMR 7828ssc last week. I ended up getting 5 cans all they had. I am going to try it in my 280AI and 300 wby. Both with 26-inch barrels.

[@ReloadingWeatherby]

IMR 7828 SSC is a staple powder for 300 WBY.

[@nmelkhunter1]

I really wish I could find some IMR 7828 ssc that won’t cost me my right arm for my 7MM Rem Mag. I’m now using IMR 4831 and the accuracy is still great but the velocity is only 2950 vs 3040 with 160 partitions. Not huge, but…

[@ccfdmd]

Wow, I can't find 7828 anywhere

[@thebryguy96]

@@ozark_trapper to get 5 lbs is golden. You will probably find it a bit slow for a 280ai. Excellent in a 300 wby. What bullet weights are you going to shoot

[@thebryguy96]

@nmelkhunter1 try n560 with the smaller bullets and n565 with the heavier ones. 560 will also work with a 175 or 180. It's just a touch faster than needed.

[@95GTSpeedDemon]

I have been playing with the MP powders & "known" common powders with .243 & 6.5cm. Utilizing GRT to keep from blowing my head off 😂. Case capacity and seat depth make a differnce. Case brand to brand arent equal and it matters when loading to "max". Some combinations like different powder. In .243, a 108 has no loadings for varget. If there is a loading for 100gr+, it shows the lowest velocity. Internet people say its the wrong powder. Well, taking some fps measurements and comparing with GRT, i worked up a load. Guess what, shoots damn close to the book max of h4350 in speed (26" barrel too) and accuracy is better. As the powder gets a higher fill ratio, it seems to burn faster too. So that slow powder starts acting a little faster. Just have to be mindful of everything when experimenting. Good video explaining this stuff btw.

[@anamericanpatriot5230]

True info Nearly 15 years ago I started running my 7 mag in 26 and 28 in barrels using H1000 and seating accubonds out a long ways Also Retumbo powder

[@WCFD5045]

I don’t think anyone disagrees with your analysis, even Hornady themselves. The point of the 7 PRC was to create a SAMMI spec chamber/barrel twist and achieve custom 7mm mag rifle results from off the shelf rifles.

[@ReloadingWeatherby]

You would be surprised

[@WCFD5045]

@ surprised by which part?

[@cobannie]

Remember that chamber cut specs are also important when adjusting these parameters… The typical chamber cuts / throat for the lands of a belted magnum are different than the PRC as well as the clearance around the chambered bullet. I find the PRC design much more forgiving to adjustment of seating depth than the older belted magnums. Trying to seat some 300 win mags long and you’re engaging the rifling before it’s fully locked closed. Make sure to measure your seating depth range before cranking out adjusted rounds. Seating depth too long/shallow, and filling more powder MIGHT be safe - but if it hits the rifling and gets pushed deeper into the case upon chambering you should expect a pressure spike.

[@ReloadingWeatherby]

Well.. Yeah

[@cobannie]

@@ReloadingWeatherby Good video - this was the first one on your channel that I've seen drift across my feed. Will check out some more of your videos! Keep up the great work!

[@h.a.4286]

Thats why the pressure-drop/curve of the powder in the barrel matters. The longer the curve (slower drop) the faster the bullet will leave the barrel. (That doesnt mean a fast powder has a fast pressure drop. It just burns out early) Thats why i load my magnums with RS60. I get about 65 fps more than with VV N550 at the same calculated start-pressure in my 300 WSM.

[@ReloadingWeatherby]

Thanks for watching and sharing

[@rudygeorgiamulesandcountry1594]

Handholding is a fascinating topic compared to plain , "reloading" !

[@hickoryridgefarms]

Can you do this again with the 300 prc and 300 win mag? Thanks

[@ReloadingWeatherby]

Maybe

[@xxshiftlockxx]

One additional thing to note here, this is all perspective. For someone like myself, I plan on re-barreling my 300 win mag to a 7prc. Why? Well right now my 300 with a 24" barrel running a 200gr eldx with H1000 powder is going about 2850fps. Even at 2850fps matching the 300, the 7prc with a 175/180 bullet still beats it due to higher bullet bc, which will stay supersonic further and fly flatter. It has less recoil. Uses fewer components, so technically will be cheaper to reload. Also with running a short barrel, will be lighter and easier to wield when hunting. Especially when running a can. Again this is all personal preference.

[@ReloadingWeatherby]

Thanks for watching and commenting

[@Greyzonecompliant]

GRT is the medicin against much of the marketing fluff. Rip Gordon 🙏

[@BeaterJeep]

Good video…… LCGW speaks loud here… I Sim’d 565 a while back (7 PRC) and asked in the comments on that series about it not being used - I’m curious about your thoughts on 565 (vs 560) for case fill vs burn ratio with the heavier bullets… I know my thoughts - maybe a continuation of this video? … I plan to buy 565 for testing soon.

[@ReloadingWeatherby]

In a 26 inch barrel it seems to be ideal powder for 7mm PRC. Theoretically you top out around 3070 FPS and still have 100% burn rate at lower charges as well. With a 175 ELD-X

[@nicholasbarcomb2324]

I purchased some VV N565 just about as soon as it hit the market. I tried it in my 280AI with a 160 gr Hammer Stone Hammer bullet and blew primers on the lowest charge modeled in QuickLoad. I then did a 10% reduction to work back up and had a stiff bolt throw on the minimum charge with loose primers. So, I stopped using VV N565 for the 280AI and used it for my 25-06 Rem with great success on Hornady 117 gr SSTs. Good luck, and stay safe!!! 😉😉😉

[@BeaterJeep]

@@ReloadingWeatherby my thought exactly… I bought Grand to test. I think 565 will be next.

[@LittleCrowGunworks]

​@BeaterJeep N565 and RL26 are the ideal powders for the 7 PRC with 175's in a 24" or longer barrel. We used the 160CX as you know, which put us in a position where we wouldn't be at 100% burn until the pressure was toward the top. So I opted not to use it. N565 is a fantastic powder. Probably my favorite "all purpose" magnum powder for 26"+ barrels. Over H1000, Retumbo, RL26, or anything else frankly. The only thing that produces more velocity than N565 is N570, but that powder isn't optimal unless you have a 28" or longer barrel. Or a super magnum like a 28 Nosler or bigger case. If you have a 26" barrel and want to run 175's, use N565 and never look back. Getting 3000fps will be EASY.

[@LittleCrowGunworks]

​@@nicholasbarcomb2324 this video is for you. N565 is WAY too slow for a 280AI and a 25-06. It's very similar to H1000. Watch Ultimate Reloaders 280AI video. His groups and ES were absolute trash. Why? Because he used H1000 for everything. That powder is WAY too slow and wasn't burning even 94%. If he would have used N150 or H4350, he would have looked like a genius. Use the right powder for the case and most of your headaches will magically go away.

[@timviering9559]

Very good information. What app are you using?

[@ReloadingWeatherby]

GRT

[@texpatriot8462]

Instead of picking the cartridge first then cutting the barrel to 20," could GRT be used to pick the best cartridge the barrel length and bullets are used as fixed inputs?

[@Iscariot18]

GRT has it the other way around, the Parametric Powder solver, which YT'ers don't seems to be using. You implement exact variables like your target velocity and load capacity range and the program synthesizes a list of powders that fit your criteria. It's the shortcut way.

[@ace60485]

I have a 22in Bregara chambered in 7prc and when i was out shooting the gun for the first time, both of the weatherby Loadings where shooting high 2900- 3006 fps for both the 175 gr Berger hybrid hunter and the 177 gr Hammer customs. I can't attest to accuracy as my scope rail came loose.😢

[@ReloadingWeatherby]

Dang that is fast

[@maxwatchm]

Great video - very informative!

[@ReloadingWeatherby]

Thanks!

[@jimedick9496]

Excellent video and well explained

[@ReloadingWeatherby]

Thanks for watching

[@agskytter8977]

I hunt with a bone stock Sako 75 in 7mmRM and it works great. However, it is too long for a can. In the US I see a lot of very expensive custom rifles in 7prc with short barrels an cans. Why not use a Blaser R8 that give 3 1/5" extra barrel length for the same rifle OAL as a conventional bolt action for 7RM or PRC as we do in Europe?

[@jameswilson5562]

Great video u are right . Finally yesterday broke out the 338 378 with 270 grain eldx factory gun chronograph 3 different powders it and 338 rum with 28 inch barrel weatherby is a beast

[@ReloadingWeatherby]

Don't leave me hanging... what velocities you get?

[@jameswilson5562]

@ReloadingWeatherby with rum 28 inch 2950 h1000

[@jameswilson5562]

What u think on the weatherby all factory gun

[@jameswilson5562]

The last my chronograph read cause of light was bad cloud was 3117 fps and I had went up another half grain but chronograph didn't read h1000

[@ReloadingWeatherby]

@@jameswilson5562 3000 ?

[@jackamelung8705]

misconception is actually sales deception to sell new cartridges, faster twist rates for heavier bullets does not mean clean kills at long distance? but that is the trend

[@jhoppmann]

How does 7mag compare to 7prc at shorter barrel lengths?

[@cwinward1]

What brass are you using for the 7mm Rem Mag load. Your GRT model is showing 86.5 grains of H2O. I think your model could be wrong. For a 7mm Rem Mag the case volume should be about 82.3 grains of H2O.

[@ReloadingWeatherby]

I'm using a case that was FL resized from my friends gun. Norma brass

[@Pat-876]

Awesome video! Can you use the grt and see how fast you could push a 180gr bullet out of a 30-06 using the 64,000-65,000 pressure instead of the old spec with a 26” barrel? I have seen people claim over 2900 with a 180 in a 26” barrel. Just seems like it might be over pressure

[@ReloadingWeatherby]

You can easily get 2900 FPS with a 26 inch barrel

[@Pat-876]

@ I’m wanting to do another rifle build. I have been contemplating what cartridge. I have watched a lot of your videos to try and decide. I’m thinking a fast twist 270wsm, 7 rem mag or?? Regardless it will have a 26” barrel. I agree, not a fan of short barrel magnums. What are your thoughts or opinions?

[@ReloadingWeatherby]

@@Pat-876 Why not get a 6.8 Western? It's a modernized 270 WSM. A fast twist 270 WSM would still be sweet. Especially if you do a custom chamber.

[@Pat-876]

@ that’s a good idea. I was thinking about that but was wondering about case capacity, 270wsm has a little more. Not sure if there is enough to gain anything from it?

[@Pat-876]

@ I am impressed with the velocities you obtained in the 6.8 western . Pretty awesome actually

[@cw2a]

BULLY!! Good topic Austin! 🎄😜👍🏼👍🏼😜🎄

[@ReloadingWeatherby]

Thanks

[@tech5565]

Question at some point could you try the Barnes LRX 308 cal 212 gr bore rider bullets for accuracy. These can be seated way out in a standard chamber. I just saw them and haven't found hardly anyone trying them...? Thanks just a thought...

[@ReloadingWeatherby]

I'll need to try it in a 1in8 twist 300 PRC

[@sweatmanjim]

Hi, Can you add the 7WSM to your comparison as well?

[@ReloadingWeatherby]

I'm starting a 7mm WSM series soon. You might like that

[@m444ss]

thanks for that explanation. very good.

[@ReloadingWeatherby]

Thank you

[@Snailz5]

I think the big astericks with GRT is that the "ideal" powder doesn't always shoot best and it's very easy to get wrapped around the axle crafting the most ideal load ever. I'll take a 93% case fill or a 98.5% powder burn and a load that shoots reliably at distance rather than buying and trying 3 or 4 different powders that give you the warm and fuzzies over your "optimizations". A perfect example is the guy doing the little crow videos saying his boss shoots very tight groups with H4831SC in 280AI and he didn't want to use it because it wasn't "optimal". I like the program and it is a helpful tool, but it will definitely lead you down rabbit hole after rabbit hole playing with all sorts of load combinations for cartridges you don't shoot when you could be spending that time being more productive (processing brass, making loads, doing other shit you need to get done so you can clear out more time for the range, etc).

[@chadperry4021]

Well said however couldn’t someone play around with numbers to get a good starting point without spending money on a new cartridge they are considering purchasing? I’m planing on getting another howa mini 20” 6.5 Grendel. Money is tight. Granted your right it’s all for nothing if the gun doesn’t like the powder or bullets.

[@TexasLeverGunner]

lol, except that's not true, at all.

[@Snailz5]

@@chadperry4021Yes, that's a great use for GRT. I'm just saying it's a slippery slope of checking out cartridge after cartridge and can lead to analysis paralysis. You can also get so fixated on optimizations that you make dumb decisions like ignoring powders you already have or ignoring powders that have an established reputation for a specific cartridge because burn rate isn't 100% or case fill is below 95%. Little Crow had this play out I believe. Didn't have a load he liked for 280AI and tried N150 even though case fill isn't ideal since that's a little fast of a powder for a 160gr bullet. It shot lights out and he ran with it. If you look at GRT and use the "ideal" criteria for case fill, you wouldn't run Varget 6 Dasher because case fill is too light. Despite the fact that almost everyone winning national PRS competitions is running that powder.

[@chadperry4021]

@@Snailz5I’m just getting into reloading and gathering materials. I just recently got some used equipment and still have more to get I just heard about grt recently. Hopefully by spring I’ll be slapping steel with my reloads.

[@Snailz5]

Good luck to ya. If you don’t have a trimmer, get the little crow gunworks one. It’s very good and reasonably priced. Get an annealing chuck while you’re there and start annealing on the cheap right from the jump. Hornady Base to Ojive and Headspace gauges are also a must. The other parts (press, chamfer/deburr tools, priming tool) are all about pretty similar and not worth going crazy over.

[@michaelatkin9649]

If you measure what your lands is relative to your case and barrel with a tool, just getting a height on your bullet will get you better performance

[@BornAgain2019]

Being within 4 grains capacity of the 7 Rem mag and 3 grains more than the 7 Saum is a sweet spot to be for a cartridge in this bore diameter. Sounds like a goldilocks of sorts just needs someone to figure out how to load it to its potential, better quality brass would help also. I do agree that a magnum should start with at least a 24" bbl if you want to see claimed performance but this moderate capacity magnum is a little more forgiving with respects to using shorter barrels that lend well with supressors.

[@ReloadingWeatherby]

Hornady made a very accurate cartridge

[@jerryhall1541]

Any trouble with that app? I tried to install it but Windows blocked it and claimed it is malicious?

[@ReloadingWeatherby]

I had the same issue. You just proceed

[@edwardhoward4708]

So does this make the 7 Rem Mag require a magnum length action? That adds weight and length. Might as well get a Weatherby then, eh?

[@ReloadingWeatherby]

Yes it would

[@edwardhoward4708]

I suppose if a rifle was throated properly for a long bullet you could use a standard length action and single feed hand loaded XL 7 Rem Mag cartridges. Best of both worlds. I wouldn’t know this if not for the content that you and your fellow content providers put out. Thanks for sharing.

[@MauserM18]

Good video but why do you load 7 rem mag up to 65000 psi isn’t it max 61000?

[@ReloadingWeatherby]

I'm a reloader? Why wouldn't I? Do you really think a modern 7 mag brass or chamber can't handle 65k psi?

[@MauserM18]

hey, I’m new to reloading so just asking questions to learn more

[@readyalready4697]

I thought it was close to the lands increased pressure. Like jamming kinda sucks for pressure.

[@ReloadingWeatherby]

Kind of confusing huh? I should test it.

[@kurtissschmidt76]

I love my 7 mag

[@thehardieway]

Velocity and accuracy are not the same thing. Given a choice, I'll take a little loss in velocity to gain accuracy... Shooting a 175 grain berger out of my 7 rem. mag, H1000 consistently scored .22-.4 inch groups at 100 yards. The 4831 shows well and was decent at .5 to .6 inch groups but couldn't compete with H1000. This was in a sako S20 with a 24 inch barrel... H1000 is the most accurate power I've seen for 7 mm

[@bobmcmillen4502]

If you reload you can get better / same performance out of the Rem Mag. Factory offerings, 7 prc is the easy button. Not too Trollish😂

[@bobmcmillen4502]

FYI I finally got 3011 fps out of a 7 Prc. CVA. The barrels fast. 175 Eldx Using 4831sc. Legit .5 groups. No pressure. Same load runs 2900 out of my Mosberg.

[@ReloadingWeatherby]

Thanks for watching Bob

[@Accuracy1st]

Just got off the phone completing another Tikka order. Got 2 more left hand Tikka T3x stainless Lite in 7mm Remington Magnum while still on end of year sale.

[@TimBiagi]

Where are they on sale?

[@Accuracy1st]

@@TimBiagi gun broker. I just called a seller and got those 2 I ordered for $1600 out the door

[@Accuracy1st]

@@TimBiagi gun broker

[@Accuracy1st]

@@TimBiagi gunbroker

[@garageliving3658]

How accurate is grt? I've found some inconsistencies with what is in the books for max, grt is saying some are over 71k even after I played with col and seating depth.

[@ReloadingWeatherby]

The actual grain weight and how it matches with velocity... hit and miss. But what makes it great is you can find out what velocity you will be at with 65k psi.

[@ewathoughts8476]

Well your comparison is a bit flawed in that your 7mm Rem Mag case has an 86.5 grain capacity in H2O and your 7 PRC is 80.6. Therefore the 7 PRC will top out pressure wise sooner, and have less gas volume to propel the bullet. Therefore the 7 PRC at 3038 fps was more efficient than the 7 RM's 3054 fps since the 7 PRC took approx. one grain less propellant. Had you shown the 7 PRC at the longer COAL as you did the 7 RM, then you would have a more apples to apples comparison available. You miss the big difference, as it is case life and chamber uniformity that makes the 7 PRC. It would also have been more truthful if you had provided the case brands as there is a wide difference between brands for these cartridges. Additionally the standard 7 RM does not have the correct twist rate for the heavier 7mm bullets, and that is another advantage that goes to the 7 PRC, not to mention getting rid of the belt that does nothing but shorten case life. To make this type of comparison you need to use the same COAL for both. If you had run the comparison simulation using the same case capacity for both as well, you would see so little difference in pressure vs velocity as to make the two the same except for the inherent precision and case life features that was the whole point in the Hornady development of the 7 PRC as a modern replacement to the 7 RM. Without chronograph verification this is just a flawed exercise.

[@ReloadingWeatherby]

I see a few problems with your argument. 1. Yes the 7mm PRC is a little more efficient than a 7mm Rem mag. That's what happens when two cartridges are almost the same size. The smaller one will be a little more efficient. I used Hornady brass for the 7mm PRC and Norma brass for the 7mm Rem mag. 2. A longer COAL for the 7mm PRC? Have you ever loaded a 7mm PRC before? Unless you're shooting the 190 and 195 gr 3.340" is about as long as you want to go with the shorter bullets. There was no need for me to do a longer COAL on the 7mm PRC because it's already optimized at 3.340" 3. Obviously you don't know this... but 50% of factory 7mm Rem mag rifles have fast twists. Let me name some for you. Browning, Weatherby, Fierce, Christensen, Ruger, Remington... 4. I have done real world numbers with the 7mm PRC and 7mm Rem Mag. It wasn't pretty for the 7mm PRC. Sadly I only had a 24 inch barrel, but velocity was garbage. I'm being more than fair for the 7mm PRC in this video. In fact I'm giving it the benefit of the doubt. 5. Finally I would highly recommend you watch Little Crow Gunworks. He does the most fair comparison with real world results between a 7 mag and 7mm PRC.

[@ETOILE123]

du bla bla rien que du bla bla

[@nswfftp]

@Reloading Weatherby Next video similar format 300wm vs 300 prc

[@thomasdaum1927]

How about the 300 WBY vs the 300 PRC ? Oh that’s right it wouldn’t be fair !……..

[@PNW-LOGGING-HOMESTEAD]

Anyone have a idea what a 16inch barreled 7prc shooting factory hornady hunting rounds would theoretically be doing speed wise? Just curious...

[@ReloadingWeatherby]

Theoretically around 2500 FPS

[@PNW-LOGGING-HOMESTEAD]

@ReloadingWeatherby thanks partner

[@zackogden716]

I used to have a 7mag, chose 7828 (original not ssc) and got good velocity and okay ish groups. Terrible sds. H4831sc shot much better but the velocity sucked. I eventually just got rid of it.

[@ReloadingWeatherby]

What bullet were you shooting?

[@zackogden716]

@ 160 class. A lot of 162 interlocks, 160 partitions. 162 interlock shot much better. I did try others outside of that, that rifle shot a 140 Berger well, bad results with 150 ttsx, did some target shooting with 180 Sierra match kings.

[@h.a.4286]

If I load the 7 PRC in GRT with your settings (copied your values) with RS76 i get 3081 fps @64788psi and 99.3% load density. Just the right powder XD. But if i use the default 7 Rem Mag @ 3.55 OAL, I get 3095fps @64788psi and 97% load density. So the 7 PRC is getting close.

[@ReloadingWeatherby]

They have always been close when you use a 26 inch barrel for both of them. But almost no one's uses a 26 inch barrel 7mm PRC

[@nathanakins6072]

Would you have any recommendations for lighter bullets in 6.5 Prc? I’ve tried 4831 and been fairly unimpressed with results out of a 24” barrel. I was thinking about trying H4350 but most say it’s too fast for the calibre.. this is with 127 lrxs

[@ReloadingWeatherby]

You not happy with the velocity?

[@nathanakins6072]

@@ReloadingWeatherbyyea I’m only getting 2870 out of a max charge according to Barnes I haven’t went above yet. Accuracy has also been mediocre at best but I haven’t messed with seating depth much yet so I think that could be improved upon that way.

[@ajdube9967]

H1000 works good for 140 Bergers

[@ReloadingWeatherby]

@nathanakins6072 Are you seeing any pressure at all? Some book data is not accurate at all. In theory with H4831SC you should be getting around 3100 FPS at max velocity. I say in theory because every gun is different.

[@ReloadingWeatherby]

@ajdube9967 Way too slow of a powder for 6.5 PRC

[@travisweldmaster7815]

I have a 7 rm load i worked up yeeaars ago for a shaw custom chambered barrel i put together, over book dose of rl25 seated very long 168 accubond ling range, very fast very accurate

[@ReloadingWeatherby]

I bet

[@EasternMountainHunters]

So your claiming that a 7 PRC is slower than a 7 REM Mag which it should be 6 grains less capacity in water. When shooting the same bullets. Changing the bullet seating depth only changes pressure and capacity in the 7 Rem due to its design. The 7 PRC has already gained what it’s going to gain. However 30fps slower with 6grains less capacity I’ll take the 7 PRC all day. If I want speed shoot a 28 Nosler 🤷‍♂️

[@ReloadingWeatherby]

N570 would have been a better comparison for getting the most out of a 7 Rem Mag. I just crunched the numbers and you can get over 3120 FPS with a 175 gr. N570 is not an ideal powder for 7mm PRC, no matter how many people swear by it. But with that being said when you use a proper barrel length in 7mm PRC, there is not much difference between it and a 7 Rem Mag.

[@EasternMountainHunters]

@ right it’s not a lot of difference. To me in the shooting world it’s what you want from the cartridge do you want a big magnum like the 28 nosler, a turn key magnum to shoot heavies like the 7 PRC or do you want a classic good all around 7 REM or 280ai. I think most people forget they just made these to be able to shoot heavy bullets. If I’m shooting a short barrel I’d want a 7-08 or a 7rsaum. I don’t like the 7 PRC but it’s a turn key option for people who want something other than the 7 REM it’s not better to say.

[@jasonshults368]

Many, many rifles I have seen shoot the best at pressures above max. Max is arbitrary. Many modern powders prefer higher pressures.

[@ReloadingWeatherby]

You do you man.

[@henrymoreland8719]

As a hunter what did I learn. Stop chasing rainbows, chill, use the barrel length your happy with, use the factory ammo that shoots well in your gun, and restrict your range to something more suitable ( realistic ). Thanks for the head melt😉.

[@michaelmichaelson8452]

I'm more about accuracy than velocity and taking shots on game at ethical hunting distances.

[@ReloadingWeatherby]

Using the right powder is all about accuracy

[@hopefulballistics]

Very interesting

[@ReloadingWeatherby]

Thanks for commenting

[@glennllewellyn7369]

Still mystified as to why peeps need such heavy projectiles. Fast(and accurate) is fun. Lobbing things in? Meh.

[@ReloadingWeatherby]

It's all the craze

[@seth094978]

I'm curious. In something like this where 7828 is a bit fast and dense, and H1000 is perhaps a bit slow and bulky, what would happen if you loaded, say, 35 grains of 7828 on top of 37 grains of H1000? Clearly you want to work up from lower charges, but if the burn rates are similar, how dangerous could it really be? Seems like you might be able to get better results by basically interpolating between available powders.

[@ReloadingWeatherby]

A cocktail of powder huh? I haven't tried it

[@wildnorthadventures]

It’s all a balancing act. And for a few of us that’s where the fun lies

[@joelclark2130]

End the pain. Buy a 300wsm

[@ReloadingWeatherby]

Thanks for watching

[@BooDamnHoo]

C'mon. The REAL purpose of the 7 PRC is to shorten barrel life as much as possible without pissing off the user so much that they dump the caliber.

[@ReloadingWeatherby]

Thanks for watching

[@DonGilbertoGuruledeNuevoMejico]

Has anyone seen that AR type rifle in a 300 win mag with a DISGUSTINGLY short barrel??? I think Kentucky Ballistics showed one, (that guy is hilarious) ......but, what a waste of metal , ammo, and money, increase muzzle blast, noise, recoil, decrease in shoot ability, range, velocity,... WTF?

[@jasonharmon4314]

Good video

[@ETOILE123]

peut etre hors sujet je garde mon 308 y as pas photo

[@thelittledetailscr7231]

Don't tell me what to do!

[@ReloadingWeatherby]

Haha

[@fjb4932]

American DNA . . .

[@jacobdeem8499]

Wheres all the imr 7828 lol

[@ReloadingWeatherby]

H4831SC is a great substitute for it.

[@TexasLeverGunner]

There is a big point you're missing about modern chamber designs, seating depth, and case capacity, but I reckon you'll figure it out. You're close.

[@ReloadingWeatherby]

I'll bite...What am I missing?

[@TexasLeverGunner]

@@ReloadingWeatherby Can't tell ya. I know that's not the answer you want and it's not the answer I want to give you, but it's just reality. There is an advanced load development course you can take with Reloading All Day and that will answer the question for you.

[@ReloadingWeatherby]

@@TexasLeverGunner I have a good friend that swears by Reloading All Day load development course, and even he has no idea what your cryptic message means.

[@BLKSMShooting]

Yes,Yes, Yes!🎉❤

[@ManjaroBlack]

Touché

[@robertoaragon1506]

👍

[@kingy300wby]

Saami!! Who is saami? Never heard of him or her!

[@ReloadingWeatherby]

Most reloaders don't

[@kingy300wby]

@@ReloadingWeatherby in all seriousness though, good explanation on burn rates and barrel lengths ect 👍🏼 people seem to forget very quickly that all they are firing is a projectile out of a bore size with a certain amount of powder pushing it! Brand names mean nothing! Case capacity is where it is at and nothing more.

[@HB-kp6rl]

Nice

[@eskimoreloader]

7PRC if you you want speed get 28 nosler 😂

[@ReloadingWeatherby]

Thanks for watching

[@mosinw6697]

I forgot ..... Merry Christmas evryone

[@ReloadingWeatherby]

Merry Christmas

[@FightinWinchukian-i1x]

so if I'm running a 22" barrel and a can on my 7prc I'm gonna basically get the velocity of an OG 1962 7 rem mag. the round that won the west. knocked the bejeezus out of game all over the world. cut to meme of the Star Wars crew getting their medals pinned on in the original movie. or Hansel telling Derek to derelick his balls.

[@ReloadingWeatherby]

That's one way to look at it. But another metal ceremony meme comes to mind for me.

[@FightinWinchukian-i1x]

@@ReloadingWeatherby which one lol?

[@Imasaint22]

@@FightinWinchukian-i1x A person giving a metal to themselves

[@BigTimberLodge]

7mm PRC hater

[@ReloadingWeatherby]

Haha

[@Eric--zs6um]

Devils always in the details. 7 mag all day.

[@ReloadingWeatherby]

Thanks for watching

[@DenverFannin]

300 wm just fine lol