6mm ARC: Fact or Fiction? Real Performance Results, From-Scratch Experimental Load Development

[Make sure you read the disclaimer below before watching]
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Is 2,750 fps feasible for 6mm ARC? In this video I'll show my wild west load development for 6mm ARC using QuickLoad software, give a preview of the CMMG Endeavor 300-series 6mm ARC AR-15, and also determine if 2,750 is realistic for 6mm ARC.
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The load development techniques and load data shown in this video are experimental and are for DEMONSTRATION PURPOSES ONLY. This data and these techniques can not be assumed to be safe. Always used manufacturer's published load data! See the rest of the Ultimate Reloader disclaimer below.
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The following Ultimate Reloader partners are featured in this video:
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[@richardscarlett7942]

Ive always felt that Ammo manufacturers should include barrel length and twist rate in the data on the box

[@bozaiwarrior]

They usually do have what the test barrel length is unless they have changed how they mark the boxes

[@saturnmedia1]

Hornady says “”24”BBL”” on the white box. I’m assuming that means “24 inch long bull barrel”. They made it for a 1/7 twist rate.

[@LRRPFco52]

@@saturnmedia1 “BBL” has been an abbreviation for “barrel” dating back decades.

[@leeeng478]

Barnes shows their data for the 6.8 SPC in a 16.5 inch barrel which is great. I know I can build a 6.8 sporter and hunt. The Grendel needs a long barrel to perform, BAD!!! 6mm ARC also seems to need a LOOONNNG barrel to perform BADDD!!!!! Everyone appears to be avoiding the shorter barrels in the 6mm ARC and that is NOT a good sign! I hate Hornady hype

[@LRRPFco52]

@@leeeng478 Neither 6.5 Grendel nor 6mm ARC need long barrels to perform. I put that myth to rest when I ended up with a 16” barrel initially for my first Grendel, even though I wanted a 20”. At the time, you had to be on a notification list to have a chance to get one through Midway USA (2009), and I put the longer barrel in my cart, went to check out....gone. I went back to see what showed in-stock, and it was either a 24”, 18”, or 16”. I put the 18” in and went to check out...gone. Went back quickly, threw the 16” in the cart and was able to check out. I initially handicapped the 16” Grendel to only shooting 600yds or less because this was the mantra online at the time. On a dare, out in one of my frequented shooting areas, some guys challenged me to try to shoot a target at 1200yds they had been trying to hit all day. I plugged in the data into my ballistics app, which said 14 mils elevation, and turned the turret until it was maxed-out, then used some reticle hashes for the rest. First round hit right off the bottom left edge. I used that as my new aiming point and let the next 4 rounds go to that point as fast as I could reacquire and break each shot. I then built a Lilja-barreld 18” Lightweight Wasp profile Grendel and spent 3 years working with it in all my courses and anything where I would shoot traditional rifle distances, as well as long range. I normally only shot .260 Remington at those distances, but left the .260 Rem alone mostly so I could marry the Lilja Grendel. I built a lot of 20”, 18”, 22”, and 16” rifles and uppers for other guys as well during that time, test-firing them for accuracy. A few years ago, I built 2x 12” Grendels with Group Buy Faxon barrels. 90gr TNT Federal factory load does 2700fps from those. 120gr Federal OTM does 2400fps. From the 17.6” Lilja Grendel, 90gr TNT does 2900fps. 120-123gr factory ammo does 2450-2484fps.

[@_cal_techie]

You, sir, are a breath of fresh air in a stuffy room. As a retired engineer I so appreciate experiments, data and analysis without the opinions or conclusions based on emotions or feelings. Whenever someone tells me "This is better than that." my response is "Show me the data." That shuts them up pretty quickly. Great work!

[@cheetothealmighty]

I'm liking the looks of 6mm ARC. This was an excellent early look into the performance potential this cartridge might have. Great job creating content that was excellent and very helpful!!!

[@dabonehead101025]

About your comment her that asked about you using all of the high-end equipment? I think that’s fantastic! I love the minutia and details that you go into and consider on deriving your data. I agree with you in that you provide some of the best and most accurate technical data on the web. Keep up the great work.

[@PrecisionRifleNetwork]

Nice. Thanks for the data-driven approach. I should have one of these in hand soon i'm told. Looking forward to reviewing it.

[@mikeblackford994]

I appreciate your engineering approach. No stones not over turned

[@unclebob540i3]

I am really looking forward to seeing what this little guy can do. I was all set to build a 6mm AR when this was announced. Can't wait to see you stretch this baby out and see what she can do. Keep up the good work.

[@Gtc-hr3gc]

I’m just waiting for more companies to start selling chambered barrels. I’ve been excited about this cartridge for a while. I was getting ready to order a 243 lbc barrel and then hornady came out and announced a factory offering. (Praise be to hornady). I’m honestly excited to see anything you do with this cartridge.

[@SlavGuns]

Brownells, faxon, ballistic advantage, sanders armory, odin works. Rainier should not be far behind.

[@WestDesertShooter]

Gavin your results seem very inline with what Hornady claims vs what I have actually seen and recorded with a labradar and 22” barrel. Factory ammo at 2730 FPS in my 22”. I really like that you account for the gas system. Another thing to consider is barrels sometimes speed up with further use. You could easily see a 25-50 FPS bump in velocity with more rounds down the tube. At which point for you barrel length would be right on par for what Hornady claims. Very cool to see insight on how you use quickload to come up with a recipe. Great work!

[@Ultimatereloader]

Thanks Logan, looking forward to comparing notes and data as we both get further along in this journey!

[@justinlance4174]

Hornady over hyped this cartridge.by up to 200fps over its actual performance. That said its probably still a great cartridge. I still prefer 6.5grendel.

[@Nick-sx6jm]

@@justinlance4174 How did you come up with 200 fps? West said that factory ammo was almost spot on advertised with 2in shorter barrel. Factory ammo is never as fast as a good handload so that can be turned up. I think gavin is using too fast burning powder here and would benefit from something slower. If you look up johnnys reloading bench he has a vid where he loads a 90 gr sgk to nearly 3000 fps with some more room to go. Thats over 1800 fpe and it was out of a 18 in barrel.

[@64samsky]

I can't wait to see more, thank you!

[@thebigmansoutdoors]

Good stuff. Thanks for sharing. This is some good looking initial data on the 6 ARC. I have a lot of questions about this caliber but so far it is looking pretty good.

[@bulletsandbourbon3896]

Always top shelf information and data. Keep doing what you do

[@EagleEyeShooting]

Excellent breakdown. Im working with a 6mm AR Turbo, very similar to this 6 ARC as I wait for my Dave Manson reamer. I found 8208 XBR to put out some really impressive numbers with berger 105's and Hornady 108. Always great info here. Thanks Gavin!

[@Ultimatereloader]

Thanks Kenny!!!

[@roverrich]

Fantastic video, I’d love to see more follow up on your load for the 6ARC!

[@N556ND]

I’m really excited for this, I love 6 Creedmoor. I’m planning to build an 18 inch carbine with the new 1-10 vortex Razor.

[@fattigla]

Great data and explanation on how velocity testing works!

[@JerrBearTactical]

So I just received my Ballistic Advantage 20 inch DMR Barrel for 6mm ARC 2 days ago. I will be matching that up with an Aero Precision enhanced upper receiver with a 15 inch handguard and a VG6 65 muzzle brake. And I just bought the new Hornady 6 mm ARC custom grade die set today. I am now waiting for the Hornady Factory 6 mm 108 grain ELD match ammo to see what kind of ballistic info I get over-the- chonagraph. It's nice to see that you're already experimenting with load data, thank you for the information and the update. Should be an interesting cartridge to develop😁👍👊

[@Ultimatereloader]

Awesome! Please report back with your findings!

[@brazzy1467]

I have a CMMG 20" barrel that just came in yesterday. I used ZEV upper and lower receivers and now I'm just waiting on my reloading dies to work up a load for mine. I also have a Uintah Precision upper on order and can't wait for it to get here. Wow I also have a hybrid suppressor.

[@polymath5119]

Thanks for the investigative report; reasonable analysis. I've been curious about the 6mm ARC.

[@DusToDeath]

Thank you for taking the scientific approach to these videos. Good stuff!

[@georgeshorter142]

Awesome test and results!! 😎

[@JW-mt4vb]

I would be super interested in seeing a load work up using H335. It was a fantastic powder in my 6.5 Grendel several years ago and of course I've loaded lots of .223, .22-250, and .30-06 with it all with great results.

[@scotthamilton6254]

Great info on this cartridge. I'm waiting on my 6ARC barrel from CMMG also in 20". Looking forward to watching what your doing to develop this cartridge. Would love to see if you can use Grendel brass with minor modifications

[@williamboggs4317]

Havent even watched this and i already know its a great video

[@theodoreware7070]

My PPC experience is with 70 grr flat base bullets in I B S matches. I used AA 2460 and H322. Most competitors used N133. I was competitive using H322. I’ve used AA2460 in my .308 and have shot groups at .25 “. I love both powders and think you should try them. 27.5 grains of H322 was optimum in my PPC. You may add a few more with shoulder extended in the Arc.

[@SlavGuns]

oooh, looking forward to watching this video and chatting!

[@darrylpacholko5495]

I'm amazed at the efficiency of this cartridge! The small amount of powder being used to produce that velocity and down range energy is eye opening. The military definitely needs to look at this as an upgrade for AR platform as it exceeds 5.56 performance in every way. For me if it becomes more common and ammo is readily available, I can see a large varmint to deer cartridge in my gun safe.

[@milesn3173]

1) You trade velocity (ball powder) for temp stability (extruded) in this class of cartridge. If you want the speed, try Leverevolution powder. 2) 60ksi is going to cause fatigue failure on your bolt lugs if you keep it up. 52ksi limit is there for a reason. 60ksi would be fine if you do a bolt action rifle. 3) I think you covered it well, but barrel length is a massive contributor to reaching published numbers. I wouldn't attempt to burn a 20" barrel down trying to get 24" numbers.

[@pewpeww556]

Great content like always brother

[@hansshaffer3788]

thank you, Gavin, for diving into this. Hornady needs to disclose the barrel length and platform they were using when they got 2750 fps. this is specifically an AR cartridge, but i dont know a single person running around with a 24" tube on their AR.

[@orygun9mm761]

Makes sense that the better group is with the slowest burning powder. I've always had the the best results for any 6mm with as close to compressed loads as possible. Look forward to seeing further load development for that new 6mm.

[@bpm990d]

When I was shooting my 6mm FatRat, I used AR-COMP for 87gr -108gr bullets. Tried R-15 but it was very dirty, although that might have been a problem with gas port size. Fantastic round, glad to see Hornady offer somthing similar off the shelf.

[@kevinhart1927]

Please give detail about brass case life as you continue your 6mm ARC project. Great videos Gavin!!

[@codygranger5155]

"the best all rounder for certain scenarios" that sounds like something the government would say to explain something

[@Johnyrocket70]

Special Forces need to reach out to hit the enemy. Taliban usually attack well past the 5.56 max range

[@Rustynutsdesigns]

A wise man once said, "It works 60% of the time, every time."

[@otetechie]

80/20 rule

[@Mockturtlesoup1]

Lol. I caught that too. I get what he means though.

[@jwhiskey534]

@@Johnyrocket70 W/ that new 6.8x51mm looks like 6mm ARC is DOA

[@2charlesbryant]

The .243/6mmhas been rolling around in my mind quite a bit the last few mnths. So looking forward to more data from different sources at the designed intended use, Ringing steel at a 1000.

[@aklaunch]

Very nice video. Thank you

[@wsollers1]

Totally going to build one of these in August

[@Oldhogleg]

Glad to see you thought to try the TAC powder, it's been an outstanding powder for me for the last decade with my 223's loaded with 77gr bullets and getting over 2700f/s.

[@TheBaz43]

Wow! Great work!

[@ethancuny3913]

I think that's pretty cool I've been watching out for a while

[@ddb2285]

I am on my second 6mm Grendel barrel. Great for varmints and deer. Shot the 103 gr Hornady bullets with varget and a magnum primmer. Gives a velocity over 2800 fps out of a 3r 22 inch barrel 1 in 8 twist. Xbr will give you some more speed though but hard to beat varget for long range work. It is interesting how that .03 set back of the shoulder has slowed it down so much.

[@Bowhunter66]

Your methodical approach to your testing is awesome. A couple more powders come too mind CFE 223 and Alliant Power Pro 2000-MR. Varget is suppose to be best for 308 but I'm getting more velocity with the above powders and great accuracy to. Looking forward to your next rifle build, how about one of Defensive Edges +P rounds?

[@johnnypop5235]

Gavin, Vihtavouri N540 is a grain to grain substitute for Varget. It generally yields 50-125fps more velocity in every cartridge I've substituted the powder for. Accuracy was the same. The powder should get the cartridge where it needs to be.

[@justinwood3054]

Great video and info. Performed very well so far. When will Hornady have there factory ammo out? I would like to see the groups out of the CMMG with factory ammo.

[@mimicocto8]

Love the ballistic engineering you've done on this new cartridge. I shoot 6.5G and love them in both AR and bolt platforms. This is a tempting bit of information. With the felt recoil about the same and slightly better BC, better bullet selections, again, it's oh so tempting!

[@justinlance4174]

Actually 6.5grendel has higher BC bullets. Federal gold metal match is .560. Highest 6arc is the match a tip at .536.

[@jcnikoley]

I’ve got my 6mm endeavor 300 arriving Mon. I’m looking forward to giving it a shot.

[@richlovin2173]

I would like to see the results from using a quality bolt action rifle with a 24 inch barrel. Your analysis is so much sounder than the BS in most magazines.

[@paulvenn4447]

QL is such a good piece of software (provided you fill it with as much real world data as possible)

[@a.k.4363]

Great video!!

[@sixfivearms8896]

Every new cartridge is immediately seized upon by reloaders and wildcatted. The 6.5 Grendel case spawned numerous 6mm Grendel wildcats and we've had them for over a decade. Very pleased that Hornady has finally codified this wildcat with the new 6mmARC factory ammo. Thus, I recommend starting your load development with the 6mm Grendel/6mmAR body of knowledge. For example, try the 6mm 108 class with Hodgdon Leverevolution powder for best velocities in 6mmARC.

[@theaveragereloader7222]

Have a 6mm 6.8 pushing 95gr tmk at 2720fps .5moa groups. I was wanting to switch to the arc but I feel it might not be worth it with results you got! Looking forward to more content on the arc!

[@stevemartin1111]

I like what I see planing a build barrel twist looks right I am wondering what more barrel length will do for velocity keep up the good engineering thumbs up

[@petersouthernboy6327]

Good gravy Marie that 6mmARC can group !

[@TexanUSMC8089]

I've had a 6mm Predator for a couple of years. I load the 103 eldx with IMR4895. My barrel is a 22 inch barrel and I have no problem getting about 2750 fps. All my brass is hornady 6.5 grendel.

[@wr3921]

Love the content on 6mm ARC, and I'm planning on getting one myself, but you are loading way over pressure for an AR. The "Average" in SAAMI's Maximum Average Pressure (MAP) refers to the average of maximum pressures of some sample size or lot. QL is estimating 61ksi and predicting your velocities pretty well, which means your pressures with those H4895 loads are far above the 52ksi MAP limit. Some folks involved in pre-launch development have posted on some forums that 25.5gr of H4895 under a 108gr ELD tests at ~52ksi in a pressure barrel, another data point to consider. All the Grendel bolt lug breakage stories are from folks loading these kinds of pressures in ARs and radically decreasing bolt lug fatigue life. It looks like with this cartridge in an AR, we'll either have to use temp sensitive ball powders (CFE223, Leverevolution, PP Varmint) to reach advertised velocities, or be happy with ~100fps less using more stable powders.

[@billcarlson852]

Cfe 223 very promising. ...

[@tvh300]

Great video as always. It would be interesting to see performance numbers out of a 14.5" and 16” Barrel.

[@leeeng478]

I saw Hornady publish there numbers in 24 inch at around 2800 FPS and when an 18 inch AR sporter was utilized the numbers dropped significantly to 2500 FPS. That means I am better off hunting with a 6.8 SPC II in a 16.5 inch barrel!

[@adrianw3985]

I like the sound of this new cartridge, in fact I bought a lower a few days ago for a future build based on this 6mm ARC. Hopefully this doesn't have the difficulties the Valkrie had out of the gate...

[@TexanUSMC8089]

I don't see it having problems. Wildcat versions have been around for years. 6AR, 6 Grendel, and 6mm Predator. I've had a 6 grendel and 6 predator for a couple of years.

[@twissted1277]

Nice trigger. Great video. I have a BSF 20'' barrel being made.

[@joealmodova8672]

DID YOU GET YOUR BARREL HOW DO YOU LIKE IT

[@daneaves6470]

I built a custom 6arc gas gun. 18" proof c.f. 1:7.5, bcm upper, JP adj GB, JP rapid config hg, JP vmos bcg, radian sd ch, triggertech diamond, vortex strike eagle 5-25... hands down the most accurate non br rifle I have shot. Shooting .3 moa groups, and has a solid report out to 850 on steel. Change me from a bolt gun hunter to an ar hunter. Daughter killed her 1st deer, 2nd shot from a centerfire, at 485...dirt nap. Looks good, performs like a champ, and is super fun to shoot

[@michaelmcfarland1087]

I am ever amazed at the detail and passion you you have for each of your reviews....thank you. This stay at home thing got me into reloading.... your reviews are fantastic. Because of shoulder injuries I have been try to create a light weight AR15 platform weapon to hunt elk in Colorado with. The 6.8 SPC I built was great. Now I’m looking to find that has a little more punch without stinging me. I am wondering if you have a review or an opinion on the DTech uppers in25 WSSM?

[@kurtglo]

same principle applies to me!

[@jensencdrodney7769]

Intrested to see how far you can take the factory round vs a custom load work up.

[@leyderness3553]

Want to find a good cartridge for the AR15 not having to change to the larger platform. Excellent info!!!!!!!!!!!!! I am sure there is more info to come. Thanks for your time and great explanation.

[@thebaddest2562]

Got it double the charge itll be great. Sounds awsome

[@xlxyetixlx]

I probably won't ever get into some of these new calibers, but enjoy watching your content. Still waiting for the day you decide to start loading 50 bmg, that'll make for some fun content.

[@Ultimatereloader]

50 BMG is coming!!!!!!!

[@tyler6147]

I'm definitely interested in this cartridge! Maybe you can try CFE223 powder and see what you get. I've read a couple of places online where they were shooting 6mm AR and the site (s) said varget is not the best choice of powders to get the best velocity in that caliber they were shooting.

[@davepartlow6430]

Great work up. Looking forward to seeing how this play out with the 6mm ARC. On a side note, can I borrow your 6 Dasher for a benchrest shoot at the Huntsman World Senior Games in October???? :)

[@jerrymont2595]

I think your evaluation was on point

[@Gmar69]

You're video is an addition to why I'm interested the 6mm ARC, and do I need to ditch my other rifle calibers. Hmm...

[@gregspangler5155]

Excellent 👍

[@joeldubose5762]

Very excited to watch your videos. I'm actually a nerd when it comes to the technical side of things. Your videos has good balance in its content. Good job

[@Ultimatereloader]

THANK YOU!!!! It’s so much work to find out right balance between too much data and too much talking time and not enough

[@bozo699]

Gavin, just watched the new video. I as well would be interested in a precision build with this round. I have built several builds around the 6br and improved versions. I been precision shooting for years and have no idea why I haven’t purchased quick load but your stats really impressed me!... keep up the great work . Wayne.

[@videocardzrule354]

It’s so funny, I have been messing with pistols and pistol calibers for years now! I wanted to put together an AR, I did my research and now I got a 6MM ARC. It really is a cool caliber!!!

[@firegrunt03]

keep it up sir!

[@pawswet9476]

I think your results are about what would be expected. Your methods seem very good. Great video. 6 ARC is interesting, but for different reasons. I hope it results in better magazines for the Grendel and a larger market for compatible parts. I could see getting tooled up for 6arc with a Howa mini..that would be fun for target use. Prefer the Grendel for hunting.

[@tylerfecho4454]

I've been researching 6.5 Grendel for an 18" AR upper for a while and 6ARC dropped out of the sky on me with claims of faster and slightly better energy down range. With the military looking at Barrett's 18" 6ARC I'm curious. I'm trying to learn as much as possible about 6ARC so keep the content coming!

[@crashdsnowman1]

Barrett has already dropped testing due to bolt strength concerns.

[@TexanUSMC8089]

Great video. For a normal 20 inch AR15/M16, the 6ARC would almost double the energy and range of a 5.56. When I was in the Marine Corps I wouldn't have been very happy for DOD to make the change to this cartridge.

[@scotthyde6557]

why ??

[@guitquest]

Great workup Gavin. I'm very interested in your comment you made about; I'm paraphrasing you. "I modified the Fundamentals of Marksmanship and other things to eliminate as many variables as I could from the shooting equation" Could you provide more details on what you changed and why? Look forward to seeing what you did,

[@kurtjensen7930]

I’m surprised you didn’t try 8208!!!! It’s the go to powder for the grendel

[@Ultimatereloader]

Yes! But I had none on hand :(

[@terrycollins1494]

gavintoobe 👍🏻 I’ll be waiting for this vid. Absolutely love it in my Grendel AR and bolt gun

[@garrytalley8009]

This is one of your better videos. Much better than the jib jab guest conversation videos that are usually boring and really too much opinionated. You do a good job in presentation. I have been interested in a Quick Load program but have been reluctant to purchase because much of the ballistic software upgrades I have used are worse to use than many of the older programs they replaced. When you have to scroll to read, or information is so small on the screen you can't read it well it pretty much sucks. The Lee DOS program for instance is better than their new one. The old DOS Sierra program was easier to use than the newer ones. They didn't do as much but were much easier to use and you didn't need to pull out the reading glasses to read fine print.

[@CyborgNation83]

You should check out 6mm mongoose. It's based on the 223/5.56 case, just blown out for maximum case capacity. Gets the same velocities but uses the same bolt and mags as your common AR. Simple barrel change, and bam! you got 6mm arc ballistics for a fraction of the cost. Don't waste your money people, yes 6 arc is badass and will be a huge thing for a long time after all the other wildcats are "dead" but if you reload, then you already know what's best for you.

[@reddog4017]

I totally agree with you using the best equip you can get. From scientific or engineering standpoint you need to mitigate the variables impact on the results. in my case a better shooter lol.....like any gages used in machining they must be 10 times the accuracy of the tool you are using to measure with, so you are trying to do that with your high end equipment. Don't know you background but I'm guessing you are an engineer. I enjoy your content and keep it up. More 6 ARC please as I just bought and upper.

[@nicolascardillo7615]

U need to do a video like this but with the 22 ARC!

[@northmantru6236]

6 ARC has my attention. I’m thinking of a sub 4 pound bolt gun, along the lines of a mini action kimber mountain ascent for hunting blacktails in the mountains.

[@davidcoiner6550]

That sounds awesome!

[@thomasbednar7475]

You could also do the same by necking up .223 brass to .243 (done decades ago and called the 6x45mm). More available/less expensive brass...but I like the ARC also.

[@bradbeam7254]

Thanks for spending the cash and time so I don’t have to. You’re very in depth!

[@dennishall9173]

I'd really like to see you do more with the 300 rum

[@spades0088]

I would like to see an in depth review of barrel twist, and practical demonstration of the effects on different weight projectiles.

[@Darkhalfcustoms]

read applied ballistics by brian lutz. its in there

[@kickinitoutdoors5782]

Cant wait to get my barrel!

[@justsomerandomguyman]

Would like to see testing with the Berger 105 Hybrid if possible.

[@13beyeker]

Gavin, Have you encountered feeding issues with the 6mm ARC cartridge? I am new to the platform and took my CMMG Endeavor to a long range class only to have my experience tainted by frequent magazine feeding issues both with the factory CMMG mag that came with the gun, as well as ACS mags that I read were supposed to be more reliable. Every time I would miss a shot the instructor would say you got Arced again.

[@LadCo12]

Really excited about this data! I would love to see this is a bolt action! I am shooting production now with a Tikka t3x. I would love to see you build out a Tikka instead of another Rem 700 clone!

[@br4713]

Hi LadCo12, I have made such custom Tikka T3 project in 6 Norma BR. It is very accurate and this caliber has more case capacity than the 6ARC to shoot the same bullets at higher speed (105/108 grains). I wonder what level of accuracy could be possible if it was chambered by Gavin ?

[@AlexCP2394]

26” Space Gun style target AR15 rifle for XTC competition! I would love to see some 600 yard shooting with various bullet weights especially in the 90-110 grain range.

[@wayne-oo]

Great run thru this new cartridge ! Do you have any plans on clambering hi quality barrels and selling then to the public ??

[@billcarlson852]

Yes, are You GAVIN..going to do barrels and sell them to the public... We are waiting....

[@ryangilian6432]

Would like to see a real comparison between the Grendel and the 6mm arc, using the same weight bullet, power, primer and see how that stacks up for data

[@josecoyote6079]

Awesome video Gavin do you have data with 90 grain match grade in 6mm arc?. For bolt action and gas gun more data it will be very interesting, thank you so much man👍👍👍👍👍

[@oif3vetk9]

I tried ramshot TAC with 108's out of a 24" barrel AR and the velocity was a little low for my liking. Same with N140. I did do a ladder test with N150 and got 2660 fps with no pressure signs and that's where my velocity node hit which for my rifle is good because that's where it seems to like it for accuracy. That said I can't stick with that powder because I can't find it. lol A friend was very nice and loaned me some just to do a ladder test SO I'm going to try N540. I know, higher energy powder but hopefully more temp stable than leverevolution. Got good velocity out of leverevolution but the load I worked up (28.8 grs) jumped about 40 fps with a 25 degree temp change. I don't want/need to be guessing velocity during a match when the temp starts to rise during the day. Biggest con for the cartridge is case capacity/heavy bullets/extruded powder. Not that velocity is always what you should be looking at but use of extruded powders for temp stability won't get the velocity up there where people like to see it. Ball powder will but you'll sacrifice temp stability.

[@TheCastleKeeper]

@gavintoobe how did you load those cases without the dies for 6mm ARC? You stated they where pre-primed brass; so did you just use a .243 die of some type to seat them? How did you get a crimp on it? Wouldn't that effect pressure?

[@kevink552]

So in the last two years we've learned a lot more about the 6mm arc, go to powder is LeverRevolution, while benchrest primers might work in a bolt gun they're a no go in the 6mm arc AR-15. A standard Federal small rifle primer will produce better chronograph number as well as groups.

[@courtneykerr9042]

If Varget is producing good results, I'd also look at Reloader-15; I've used both on my 6mm and 7mm rifles. 24" and 28" barrels would be interesting to compare.

[@davidhenry5791]

How about a 6 Arc bolt gun. I just had one built by desert precision gunwerks Kenny. Working on leverevolution and 105 grain bullets right now. Love to see your take

[@lp4815]

Great video...! I'm a Grendel fan myself. Still looking for an apples to apples comparison between the Grendel and the 6mm ARC. Seen some articles online and Hornady videos comparing the two, but has been mostly qualitative in nature. Would like to see a comparison with identical length barrels, and as close as possible bullet weights between the two cartridges. I saw and article on the GUN university website that had a ballistic comparison... Grendel won the energy throughout, and the 6mm ARC only seemed to have a small speed advantage; not enough to make me give up the Grendel. The comparison wasn't "apples to apples" as much as it could have been though. Still looking for more concrete data to make an objective choice. Underwood Ammo for example has a 110gr Grendel load using Lehigh Defense Controlled Chaos bullets, listed at 2800 fps. Seen pics of hog hunts with that cartridge producing massive exit wounds. For hunting/defense purposes, can the 6mm ARC produce similar results? Looking forward to more test data. Thanks for putting great content out there!

[@mikecarlson6083]

Great video thx. Was surprised it wasnt faster fps vs grendel. Was going to switch but gains might not be worth it shooting to 600 like i am