Scorpio64 5,147 Posted June 27, 2021 I took my new 308 hog hammer out to the range today for its first test firing and zeroing the thermal scope. There are two potential problems I noticed. First, the case heads were damaged, like, clawed up on extraction. Never seen anything quite like it before on a case head face, but my SPR (which is slightly overgassed) will chew up a rim every once in a while, but nothing like this. It's hard to tell from the pictures, but brass has been sheared off the face. Second, what's up with the cratering? I used factory PPU and MEN, both reliable brands, so it's obviously not a hot load. While researching, I came across a YT video that could explain the cratering. The video explains how a bolt face could have a firing pin hole that is too large, and the case head just gets mashed into it. The fix is typically a bushing in the firing pin hole, but they do that on rifles that have been fired many thousands of times. This rifle has a brand new BCG. So, any thoughts on what is causing the claw marks and the cratering? Quote Share this post Link to post Share on other sites
silverado427 10,680 Posted June 28, 2021 I'm just throwing this out there, Is there a burr on the extractor and is the firing pin to long. Quote Share this post Link to post Share on other sites
Scorpio64 5,147 Posted June 28, 2021 22 minutes ago, silverado427 said: Is there a burr on the extractor and is the firing pin to long. There does not appear to be any burrs on extractor, however, I had a closer look at the bolt and the lug face is not true. There are what look like burrs (bumps) on a couple of the lugs. I got a better look with a loupe and the entire BCG looks like it was half assed. The QPQ is all buggerd up with runs and globs, so not a good coating. I'll mic the firing pin tomorrow. Quote Share this post Link to post Share on other sites
GRIZ 3,369 Posted June 28, 2021 AFAIC there is something with the extractor to chew the rims up. You might have a firing pin/firing pin hole issue. I've fired a lot of MENwhich is NATO spec in semis and bolt guns. Never saw any cratering. I'd tend to agree your bcg is half ass without seeing it. JMO Quote Share this post Link to post Share on other sites