edwardware
Member
- Joined
- Feb 23, 2010
- Messages
- 4,424
I've noticed (again today) that a case that experiences an incipient or partial head separation will frequently show a much flatter or flowed primer than the same load in un-separated brass.
Today I reached the end-of-life of a batch of .223 LC brass after 30+ reloads and 10+ annealings. The two cases with incipient separations show extraordinary primer flow out into the pocket radius, but the rest of the primers are normal for this mid-range recipe. I recall noting this years ago in a couple different rifles too.
Anyone else see this? Any idea why?
. . . and before someone says that head separations increase bolt thrust. . . I agree. Now please explain how the primers are flattened by bolt thrust instead of internal pressure. I thought of that, and I don't think it's mechanically possible; the primer seems to be flattened or flowed by internal pressure.
Today I reached the end-of-life of a batch of .223 LC brass after 30+ reloads and 10+ annealings. The two cases with incipient separations show extraordinary primer flow out into the pocket radius, but the rest of the primers are normal for this mid-range recipe. I recall noting this years ago in a couple different rifles too.
Anyone else see this? Any idea why?
. . . and before someone says that head separations increase bolt thrust. . . I agree. Now please explain how the primers are flattened by bolt thrust instead of internal pressure. I thought of that, and I don't think it's mechanically possible; the primer seems to be flattened or flowed by internal pressure.