A little perplexed

[wvbearhunter]

I am currently running a 20" Wilson Super Sniper in 308 Win lately. It been amazing and is absurdly accurate. I also shoot a Seekins PWS MK218 which is another excellent rifle. Something I have noticed with both as I develop loads for them:

Even factory 147 gr FMJ tend to have substantial ejector swipes and flattened primers. I was running Aguila today and all the casing are non-reloadable due to ejector peel marks, from both rifles. I tried some handloads I was working up for a bolt gun, a minimum charge of Varget, same thing.

Is this a common issue with AR10s? I will admit I do not shoot mine often, its usually a 300blk or one of my bolt action rifles. It seems a waste of good brass.

Both rifles are running Adj gas blocks and A2 rifle length buffers

 

[Bucklowery]

Sounds like over gassed. Where is it throwing your brass?

Thanks

Buck

 

[wvbearhunter]

4 o'clock. Seems odd both riffles would be doing it. I planned to dial back the adjustments today to find single feed and see how it shakes out

 

[Tiny Tim]

Agree with @Bucklowery, sounds over gassed. Does seem odd that what I assume to be "factory" rifles having the same issue.

 

[Brathany]

The rifle might not be over gassed, but the buffer spring might need to be heavier. A 4 O'clock ejection is typically a good thing. I have corrected many AR10 platforms from ejector swiping by manipulating the springs and buffers. The problem is the current system isn't allowing the case to stay in the chamber long enough after firing and the brass is still at the hottest point allowing the ejector to swipe. Check out SpringCo springs.

 

[joelpend]

I have never been able to run the same loads in gas guns that I run in bolt guns. Usually a grain or two less powder. I have seen factory loads that were just too hot for gas guns. That said using heavy bolts, heavier springs and buffers, turning gas down until the bolt just locks back on last round fired may fix your issues. AR-10s are hard on brass at best. I have seen them rip a chunk of the case rim right off.

 

[LRhunter514]

I have not had much success with Aguila brass, I would try different brass