Cloning Mk262 - pt 7 - 8208 XBR and AR-Comp

[@4thforcon426]

Been reloading for years and i thought i knew what i was doing and you fixed a lot of the mistakes i was making. Since watching your videos, i've gotten better and actually enjoy it.

[@Nozz_959]

Been watching your videos since about 1500 subs. You still crack me up and I learn something every time, love the vids and love this series.

[@IvoryGoddess887]

Just loaded some of the MK's and TMK's to try out with XBR 8208 with my FN15. I seated mine a little farther out at 2.255 with those powder charges. Thanks SO MUCH for the videos. Keep up the great work.

[@johnsanford3043]

We're you happy at that charge? or able to go further on charge due to longer seating depth 🙂

[@PRL1982]

Johnny, you’ve inspired me to start reloading. I think I’ve watched everyone of your videos at least twice. Tonight I just set up my reloading press and ran my first case through it. I’m waiting on my case gauge to be delivered but tomorrow I’ll take some measurements at work on an optical comparator to see where the case is at.

[@cthomes57]

7:34 - 9:50👍🏻👍🏻 you're absolutely right ( even with the space station 🙂). Hello from France

[@JH-nf4xd]

Interested to hear what you find when you inspect the rifle. That was some outstanding loading/shooting, and those 2 fliers have me intrigued. Just picked up a pound of 8208 XBR last week and now I'm even more anxious to start playing with it. Another outstanding video in a great series. Thank you, brother.

[@DanielBoone337]

"Never copy loads from an idiot on KZbin" LMFAO you rock brother!!!

[@dgunnut6550]

Wow, two videos in one day! I just picked up some of the Sierra 77 gr. TMK's (by mistake, just wanted the regular ones) and will be referencing your videos for which powders to start with. Great video as always! Keep up the good work!

[@JohnnysReloadingBench]

I am looking forward to trying the TMK sometime soon. The TMK is significantly longer than the SMK, so you will probably see pressure with them a little sooner. More bullet down in the case at mag length. It's not necessarily a horrible thing...just watch out for pressure. Let me know how they shoot for you! Good luck!

[@dgunnut6550]

Johnny's Reloading Bench I just loaded up some of the TMK's today with AA2520. Started at 23, going up to 24.5 to start. The weather has sucked here as well, not sure when I'll get to the range to try them, but I'll let you know how it goes.

[@MrArmede]

Johnny's Reloading Bench I’ve been messing with TMK’s and MK’s for about a month with XBR8208. The TMK’s love to be seated longer at 1.837 OGIVE or around 2.270 to where they still feed reliably through metal and magpul mags. I tried the same thing with MK’s and the accuracy was HORRIBLE. The MK’s definitely like it around 1.880 or 2.246 like in your videos. I’ve been using BR4 primers for testing but watching your primer videos kind of makes me want to try Federal AR match. Your videos are awesome for a newer reloader like myself. Thanks for all your hard work man.

[@chevrofreak]

You are definitely my favorite idiot on KZbin and I am very grateful that I have hours upon hours of your videos to keep me entertained.

[@glen4130]

Rewatching all your videos. This is good stuff.

[@fredmeebley]

Same here, hellofa good reloading channel. Learning a lot, keeping me motivated and entertained.

[@kylelusk8994]

Nice work sir! I’m glad I’m not the only one finding anomalies in some of these ladder tests. I’ve been focusing on cast loads as of lately, for the simple fact I went through load developing enough with a bulk bullet. (No names please) , but I have my load. And it works in most ar’s. The cast world adds a lot of wtf’s. Hahaha. As I know you know. But I have had stupid changes as well. And I (knock on wood) have never hit my chrono. But personal experience, if your damaging the case, that load is kind of a useless endeavor. I know you have went through all the pains (changing barrels, primers, powders, etc) Sometimes it’s just frustrating brother! But you keep your wits on camera! Nice job sir!

[@billmcyrus]

As Hornady 75gr match is nonexistent right now, I picked up a bunch of SMK's to work on as a substitute. This is the info I needed, thank you!

[@ccwynn6657]

Here is a hint on keeping primer pockets snug at 60,000+psi chamber press. When you rework the once fired Lake City NATO Military brass, swage the crimp ring back just slightly so that the new primer cup will fit without snagging on the burr you rake out when you decap while sizing. Do not machine away the brass crimp ring, as some are want to do. Experiment with the swage nib setting so it just barely bumps back the crimp ring burr. Primer pockets are going to expand. No way to stop that unless you reduce pressure. Keeping a good interference fit between the crimp ring artifact and the primer cup delays the point when you have to toss the brass case.

[@CoachKalu]

And stop cleaning the powder residue out of the primer pocket. It doesn't need to be shiny, just a clear primer hole. For that reason I dry tumble my brass before I deprime. It keeps the media out of the primer hole and retains a bit of carbon residue.

[@Turboy65]

CFE 223 will allow you to easily duplicate or exceed the 2750 FPS velocity spec of the MK 262 Mod 1 load when used with the 77 gr. Sierra Tipped Match King bullet.

[@jasonfife2751]

Why would somebody give this a thumbs down?! Would love to see these powders revisited once you get your gun sorted and after you're done eliminating the other powders. Video idea for your coming rainy days. For the sake of others not blowing off their face, maybe discuss and show the signs of different pressures and how to read and interpret them for those that don't really know what to look for?

[@wbpursell]

that thumbs down must have been someone making a random mouse click. How can you not like a video this good? Excellent groups.

[@breed4659]

@@wbpursell i think a lot of likes and dislikes are accidental. Theres been tons of times i noticed the blue thumb either up or down on a video i had no intention of liking/disliking.

[@reelamor9950]

Excellent shooting ! I got lucky with 8208 as my go to powder for my version of 77gr.

[@ron4hunting]

i know this is old . but you are right about altitude and temperature . i found this out when i moved from mi to tn . hadn't reloaded in a yr . got set up and loaded a 100 44 mags with a 245 gr keith bullet . and used the old keith load of 2400 powder . this load was good and no pressure signs when tested . in a cold mi winter . around 28* . when i loaded them in tn it was 95* and summer . same jug of powder , same primers and brass . fired 6 rds . and had to beat the case's out of all 6 chambers ! with a wooden dowel and hammer ! and they realy took a beating to get out ! so be careful when you move for temp and altitude . that same load and velocity here in tn is 4 grs lighter then the original load !! and good ole elmer keith worked his load up in the rocky mountains .

[@isaywoopow]

Just got some 223 dies, been loading .40 Time for me to step up lol Awesome great videos !!

[@JohnnysReloadingBench]

That's awesome, brother! Glad to hear that you're branching out!

[@kylelusk8994]

If you don’t mind me asking, is it jacketed or cast?

[@williebulletman5217]

Keep rocking out these videos these are really cool

[@brandonjohnson3120]

22.6-22.9 grains of AR-Comp + WSR primers have always been an accurate combo for my heavier projectiles. 75gr Speer Gold Dots 75gr Hornady BTHP 77gr Nosler CCs 73gr Hornady ELD-Ms Works great for all those.

[@jimhelton5731]

The first thing that came to mind was a light baffle strike. Anytime you can pull a 1.7 standard deviation it reaffirms that your loading process is solid. Great video brother. Keep them coming. Curious have you considered picking up a 6.5 Creedmore. With the right bullet makes an awesome elk cartridge and available in an ar platform. Would make some great videos on a new cartridge. Good luck next week.

[@JohnnysReloadingBench]

6.5 Creedmoor will be coming soon. Still months away, though.

[@Johnny-jr2lq]

Got Shannon out here back in the day driving miss Daisy.

[@arl0xen551]

I love this series! I have followed along with my load testing and have basically had the same results with the same powder as you have. As of now the AR comp is my top contender, but I have yet to ladder test the Vitu Vorhi (sp?) powders. Thanks for putting all of this great content out there for us to sample.

[@jerrymont2595]

Good educational advice and cautions about copying loads !!!!

[@ack495]

Still come back to watch your videos when I’m researching what I’m about to load. Thanks for all of it. I wonder if you’ve listened to The Hornady Podcast or watch their KZbin videos on load development and group size and how that would affect your Reloading today. It certainly has mine.

[@matthewdockter2424]

I use 8208XBR in mine. Can't wait to watch this to see how you do with it.

[@thebaddest2562]

Ill admit its alil hot for everyday but ive hot rodded the 70g berger and arcomp w win primer to 24.8g and it shot kick ass out of a 16"ar at 600yds but i backed off for my normal loading to 24.3. 24.8 was starting to get some crater marks on the primers.77g sierra and arcomp 24.0 is what i run. but i got a 5.56x45 chamber. If you are gonna play with blowing your face off preasure you must do a flawless job of brass inspection especially in 223/556

[@EE-eg2bp]

I have to say that you are one hell of a shot. I think you're shooting of a regular Protektor rear bag with a collapsible stock and a 3.5lb CMC single stage trigger. Man it's not easy to get those groups and you do it consistently. I saw your vids and was like I can do that. Then I started shooting from a bench with a more stable setup and sweet trigger but I can't get consistency to save my life.

[@Dustysa4]

In general, there's a little voodoo and witchery involved in "reading" pressure. Just for conversation sake, say you switched to a die that sizes your headspace more. Now the firing pin knocks the case forward, and powder ignition slams the head back in to the bolt face. This can cause ejector marks. And reading primers...30-30 & 308 use the same primers. By the time you see flat primers in a 30-30, your gun is likely toast. But flat primers can also be from a pocket that's too deep, causing the primer to slam back against the bolt. I've had flattened primers using CCI 400's with light loads because the cup is ~.005" thinner than the CCI 450's. Winchester primers are thinner and soft, making them prone to piercing. Federal brass is basically made out of silly putty and the head deforms when I size it. And cratered pin strikes can be pressure, or an oversized firing pin hole. You seem to be holding reasonable consistency, so the swipes are likely a legitimate sign of increased pressure. But like you say, you have to be very familiar with your gun AND be absolutely consistent in your loading to make any meaningful determination from these signs. These techniques are often misused because their limitations are not recognized.

[@JohnnysReloadingBench]

Yup, I agree with all of that! I'm planning a video soon to explore the topic a bit more.

[@Dustysa4]

Nice! Looking forward to it.

[@J9_j3]

these brakes between videos are killing me man!

[@camerongiroux1213]

I worked up a load with ar comp 23.6 gr 77 gr berger otm tactical oal at 2.246, lake city brass, out of a 16" carbine gas length, with very very minor ejector marks. Nothing to worry about. Average velocity of 2662, at 12.1. Absolute tac driver. 5 shots at 100 yards 0.5".

[@ironcity4392]

Loved your PSA

[@davidpeterson6147]

another excellent video.

[@jeffyoung2089]

Awesome shooting!

[@richardc-ex7rt]

Both of those are my favorite powders for 77 grain Sierra’s. AR Comp is slightly better. Charges of 22.1, 22.7, and 23.2 all gave me sub-1/2 moa groups out of my LaRue Stealth barreled AR. 23.2 does show the slightest pressure signs so I stick with the 22.7 charge for a loss of only .1 moa.

[@jdh9_]

You may be on to something with your chronograph. I have the same model magnetospeed and over time with it attached to a suppressor the plastic shim closest to the suppressor slowly melted and compressed. This resulted in the very tip of the magnetospeed raising up towards the bore and eventually I grazed it. Take a close look and see if something similar is happening to you. Once last thing. I have to give you a bit of a hard time. You seem willing to go into high pressure territory with some of these powders but you wussed out with Varget. Should have taken Varget to 25.5 grains. Maybe at the end of the series in a video to tie up loose ends you should consider going a little higher with that powder. I’m loving this series.

[@davidperkins6494]

I could understand a chronograph strike causing a 4" high impact, but I dont know how that would cause a 16" low impact since the bullet was not tumbling.

[@AZIROC]

great videos, thanks for making them. I do find it funny that in some of your video's, my accuracy loads are REALLY close to what your's are getting for thus. for me, with 77gr im at 23.5grs of xbr, and this has been my accuracy load for 3 years now.

[@turrettooling1968]

I'm trying to recreate the same cartridge. So far, I'm pretty happy with Vihtavuori N135 and N140, but after seeing your videos on this cartridge, I want to try the N540. Alliant Reloader 15 is another good one. I think I will also try Accurate 2495. My rifles seem more accurate with extruded powders for this heavy projectile; I wish I knew why! I really appreciate your research on this topic!

[@copdoc]

The round that dropped 16”, the brass also ejected at like 4:30 vs 3:00

[@ditchdigger93]

I got a chance to buy several hundred Tipped Match King's and in late 2020 if you find anything at all you can use you buy it. They don't compensate for the tip apparently and just add it so they are longer than the non Tipped version. Thus have to be seated deeper to maintain magazine length. I dropped back to your 22.6 grain load of AR Comp and have ran with it. Slightly compressed, accurate, good enough for me and AR Comp is what I found so bought three pounds of it. 22.9 Was showing me some pressure signs with my less volume seating the bullets deeper and 22.6 doesn't. Hedge ball accuracy at 250 yards is good enough for me.

[@vodekz1534]

Johnny, how to you deal with loose primers? Do you use them again?

[@ditchdigger93]

I am an avid reloader and shooter with tens of thousands of rounds of experience in my sixty three years and still loading shells I'll most likely never be around long enough to shoot. I went with the AR Comp with the 77gr OTM at 22.1gr. Why? It shot dead nuts on in both my Adams Arms Piston gun and my Anderson Arms DI gun. With two AR'S and a Mini 14 I've got (Some) experience with autoloaders. You spend a lot of time worrying about that adjustable gas block. Find a setting where you think it's quite a bit over gassed and forget it's there ! It's got more to do with a lot of the pressure signs your reading than the loads showing them. I know with that can you use you have to adjust for that but timing has about as much to do with pressure signs in an AR than pressure itself. There are a lot of AR'S out there with a can and no adjustable gas block and I don't hear about them wearing out sooner or blowing up? With all that said, I have an old Model 88 Winchester in .308 I bought New back in about 1971 that will shoot any max load Hornady can list in a loading manual and show NO pressure signs what so ever and the empty brass just falls out of it. A friend of mine bought one of the newer cheap Remington bolt action .308 and he can't shoot my reloads at all. Blows the primers, have to beat the bolt open with a 2x4 it looks like a ten grain overload. Each gun is it's own entity. Your pressure signs show you something about your gun, nothing about mine, as you know. With all this said, I have watched all of your video's and keep up the good work. Maybe less on the loading part and more shooting though. Good Job ! Keep up the good work.

[@RemeoSpes]

Ejector marks can also be a sign of headspace problems, but there are usually other headspace symptoms at same time as the marking.

[@JohnnysReloadingBench]

Very true! That might make for an interesting video. Pressure sign differences with different amounts of shoulder bump...

[@JohnnysReloadingBench]

Very true! That might make for an interesting video. Pressure sign differences with different amounts of shoulder bump...

[@Bifistik]

Finally 8208 XBR, I have been waiting for this one, all I load is 77smk but I am at 23.1 with good results. That is my choice for my Mk18

[@trumpie5399]

emorocksit8 That’s a good target load but not mil spec

[@danielkinsler46]

I know this is old. But does one not feel having the magneto speed handing on the barrel not affect the barrel movement that naturally happens?

[@joshjohnson1653]

OK... We are looking at all these different combinations of accuracy bullets made for DMR's ...... what about some long range shooting with them? I don't know if you have access to a place you can stretch the legs out on these reloads to see what could happen, but maybe a next thought?

[@Johnyrocket70]

that magneto deflects gas and can effect groups. take the 2 lowest SD groups and play with them. comp shooters take the fastest of the 2 and refine it. but you may want to refine the slower groups load. that will use less powder & lower velocity will do less damage to your brass.

[@riflemanjim]

Have you ever considered removing the plunger and rounding the edges. I've done it on all my ar's and it seems to not to beat up the brass as badly.

[@jacksonthompson7099]

Im probably gonna do that on my Anderson upper, even with light loads the bolt would smear or pop up a burr on the case head. I noticed the ejector had a sharp edge which im 99% certain doesn't help.

[@rdsii64]

I know this is an old video, but if you run that 23.2 grain ARComp load with a 75 grain gold dot, you have a nasty deer load.

[@jonstanhope5453]

What barrel?

[@rdsii64]

@@jonstanhope5453 20 inch

[@brianneedham6060]

would like to see you re-shoot the 8208 groups....... I did satterlee load method today with 8208, both with 7.5 primers and cci41 primers. out of a 16 inch ballistics advantage hanson barrel, my cci41 velocity numbers were not far off yours even with a 2 inch shorter barrel. ALL cci41 rounds were consistently 25 to 40 FPS higher (with no pressure sign change) than the 7.5 primer rounds with the same powder charge!!!

[@gc5Hayward]

Man you are the best! 😆

[@Dustysa4]

I think it was the last video in this series that you mentioned your gas block screw seized. That's common with adjustable blocks. I prefer a block with detents, and I'll run it full closed to full open, then back to my setting (count the detents) after every range session. Haven't had one seize using this technique.

[@VitoBb1978]

JRB your best group was 23.6 Gr's of 8208 XBR @2715 FPS, that load is a keeper

[@VitoBb1978]

For sure I’ve got some 8208-XBR loaded up for my bolt action. Hoping it really performs with the 68/69 Gr BTHP’s

[@hansshaffer3788]

I ran your 22.9gr of AR-Comp and the 77gr SMK through Quickload, and it says that load is putting out 74kpsi...😬

[@kayfrancisco7795]

What is the twist rate on that barrel?

[@R1Predator]

It is plain and simple imr 4064. Which just happens to be the powder used in the m118lr. The extreme heat/cold indifference makes it ideal and from barrels designed for the 77 gr mk and the 175 gr mk has acceptable accuracy

[@drewhansen429]

Its not as stable as you think. Ask any mil sniper and they will tell you 118lr is not stable at all, but it's easy to track

[@shaunkitsu9825]

Amazing set of videos!! I will be starting to reload 223 for my savage msr 15 recon which loves the 77gr SMK. I have purchased a cheap set of lee dies (full length sizer, crimp and seater)But, was wondering if you have any suggestions on a good set of dies without breaking the bank? Thanks and keep up the great work!

[@JohnnysReloadingBench]

The Lee dies you bought will work great! Don't buy anything else before you try them. Good luck!

[@shaunkitsu9825]

Awesome! Thanks for the quick reply. Looking forward to your future Mk262 clone videos. Can't tell you how much I've learned so far man. Just great!

[@shaunkitsu9825]

Sorry I forgot to ask.. Should I be getting a small base sizer die? I've heard of people having problems with chambering after regular full length sizing. Thanks again!

[@sylviastroh729]

Mount the chrono to the bipod ,it’ll shoot better ,nothing on barrel!,

[@TerminalM193]

THIS! I actually was using the chronograph directly off the barrel as well.... A guy at the range one day told me to try mounting the chronograph differently.... There was an IMMEDIATE difference in accuracy while still having perfectly accurate velocity.

[@kahnfox]

How do you think that federal gold medal match AR primers would do with the ARcomp?????

[@trumpie5399]

Yes 23.8 with CCI 41 77MK same load as Austria Defense force MK 262 load

[@Glenfilthie1]

Johnny - I want to duplicate Nosler factory 60 gr. match ammo the same way you are doing with Mk262. What is your practice when you are seating bullets deeper than the maximum OAL? How do you arrive at a safe starting charge weight?

[@dvfd1874]

when was the last time you cleaned your suppressor

[@wbpursell]

I guess I am uninformed about cleaning suppressors. Do they ever get so dirty as to create a baffle strike?

[@JohnnysReloadingBench]

I've never seen a need to clean it. I haven't shot enough lead through it to worry about. Silencerco, where I bought it, recommends not cleaning.

[@dvfd1874]

Ok just noticed during your last video you were having some issues and wanted to suggest some possibilities.

[@drewhansen429]

The only time I'd even think about cleaning a can, is when it starts to weigh more then advertised. Lol once they gain a few ounces.... they need a soaking. Lol usually thousands of thousands of rounds

[@TheRiverpro]

Love this series

[@sd3gunner]

please try new win staball match powder for the 77gr smk

[@redlew012]

Are you compressing ar comp at 22.3gn.?

[@brandonb8543]

Accounting for the location of the international space station I often forget.

[@KiLLaDaTa]

that damn international space station

[@tv-cx8gv]

Have you done a video on just primers? Same bullet, same powder measure etc..

[@TimKollat]

my results are similar with 8208. Its just a phenomenally accurate powder in my 223 and 308 rifles

[@lapasorsa]

Could you test Vihtavuori N530 or N540 or both?

[@tradermonk9403]

This is my gun.....LOL Loose primers eh.... Would the CCIs fit snugly? Maybe try CCI "Magnum" primers! 🤪 ;)

[@caseyeudy3646]

How do you like the magnetospeed after testing it extensively? Idk if I should get that or the lab radar. Thanks love your channel, keep up the good work.

[@MrPaco1013]

I think you meant Remington not Federal on the 23.6 gr. load when switching back and forth between primers. Just an observation

[@JohnnysReloadingBench]

Yes, definitely! I have shot a lot more Federal primers than Remington, and for some reason my brain keeps wanting to say Federal when I mean Remington. That one got through!

[@YukarisGearReviews]

Will you try H335? Thanks

[@DaveWilburn-USAF]

I have been enjoying the series. I am curious what digital scale you are using (after you take it off the Lyman). I really like it. Thanks

[@codywitt2718]

77 TMK and 23.8 gr of 8208 XBR shoots lights out in my DPMS 20inch Bull

[@thebaddest2562]

Check your gas rings real well or just replace em

[@JohnnysReloadingBench]

Thanks for mentioning that! I didn't consider the gas rings and this BCG has a TON of rounds on it. I bet that's what's going on.

[@shockwavemikey64]

either rings or maybe the gas key is loose as well.

[@jimtanner8516]

hello ! johnny i haven’t seen you checking for concentricity ?

[@elninobigdog7211]

Shout out to GUNNY RIP brother

[@soilrulz13]

Just curious how you came up with that length? Everything manual I read says mag length for the 77s 2.260. Doesn’t seating shorter increase the pressure even more?

[@drewhansen429]

He was loading to the same length as the factory black hills ammo

[@CYOTsNiper]

What loading trays are you using?

[@pwrbomb1970]

Les Laxson those are from franklin arsenal.

[@barryd.thomassr.9156]

is that a New Scale? Where did you get it? My scale is starting to get cranky. Going up and down.1 to .3

[@barryd.thomassr.9156]

found it, Thanks

[@homiegali]

Did you learn to stop spilling stuff or what? Haven't seen a good dump for a while.

[@JohnnysReloadingBench]

I don't know, man! I just haven't had a good spill in a while! Stay tuned...it's only a matter of time.

[@garnerblair5179]

Ive got a new thing to test ; rebarrel a ruger SFAR to 5.56 with a long throat , load 80-85gr to 2.5" .

[@samsungtv4u]

So analytical ... I'm geaking out man .was that 100 yard groups?

[@TheTerk]

I believe you just sold Widener's out of 8208 XBR! nice work.

[@dominickdelfino7552]

Nice shooting Johnny, are you ready at this point to declare Sierra Match Kings as the world champ of bullets? They always seem to give you the best groups

[@JohnnysReloadingBench]

I love them and they rarely disappoint. I think Sierra and Berger are just better than everyone else (of the brands we find on the shelf in the U.S.). Hornady is sometimes hit or miss and I am totally ok with that since they keep things affordable.

[@thebaddest2562]

Johnny's Reloading Bench i concur with you sir its not even close you got the blue collar bullets that shoot lights out and do everything well for the money and then most advanced mass produced king of bc and inconsistency.

[@stompinmcallister1312]

bought some honaday VLD 75 Gr just a heads up to those kinda new to reloading 75gr VLD will not load to 2.260 magazine length bought them and then found out i cannot load them to 2.260 so sad never again they need to put something on the box saying cannot be loaded to 2.260

[@hydrostaticshocker3048]

I load ELD's and feed them through my ar mag. I cut a groove out of a polymer mag big enough to hold 5 rounds. Polymer mags will hold and chamber rounds around 2.350 oal if you trim them.

[@danphariss133]

Over gassing can cause FTF issues too.

[@TerminalM193]

I actually got ripped off recently by an actual certified provider of ammunition online for purchase. Ordered 6 boxes of Black Hills 262 mod1. They arrived in black hills TMK 77G labeled boxes. I was immediately suspicious and started inspecting the ammunition and could easily find noticeable differences between the cartridges. Contacted the supplier and they said that black hills changed the sku on boxes between the two rounds and that I could call BH to confirm.... They thought I would leave it at that.... I called Black Hills and they said nothing of the sort! Come to find out the provider somehow got ahold of a bunch of black hills packaging and were taking all the good ammunition out and replacing it with factory seconds as well as what looks to be random lake city reloads....

[@BuggaBoy69]

I have a theory that the powder the government uses for military ammunition is a very fast ball powder that is kept in a controlled slightly humid state and is kept that humidity by the neck and primer seals. When I say humid I definitely don’t mean wet, but humid enough to retard the initial burn and allow a peak pressure when the bullet has traveled slightly farther down the barrel when the powder has dried where it wouldn’t put too much strain on the chamber. This wouldn’t really be replicable at home but it’s just a theory.

[@patdennis3751]

You need to clean your rifle more often. By not starting out clean during load development, you're possibly missing a good group due to the distractions of malfunctions. That and testing a load with a barrel that has already gone 70 rds after the last cleaning will no doubt shoot quite differently, either better or worse with a squeaky clean bore.

[@G5Hohn]

Finally found the pressure limit in my rifle with 8208, way up at 24.1gr with long loaded 80 ELDs. Still very mild swiping, barely visible. No speed information but I’m confident it’s 2700+.

[@Johnyrocket70]

ar15 forums are saying 23.1 to 23.5 of 8208

[@twg2118]

any way to add testing how temp stable the powders are? put some in the fridge then test accuracy and FPS?

[@JohnnysReloadingBench]

Yes, I hoping to run some tests on that soon!

[@briansouth9325]

When you inspect you should go live, be a great video

[@CreativeWarrior-]

Hitting an insect mid-flight may have knocked those two loose......?

[@blazerk9614]

Baffle strike or can is carboned up

[@briansouth9325]

Btw, check your gas rings

[@gunsnwater2668]

😎