Over-pressure only on 2nd and later rounds?
Posted: Thu Apr 02, 2020 5:53 am
An acquaintance posed me this question.
He has a bolt gun and AR10, both in 308 win. He has some handloads from a friend.
In his bolt gun they fire fine and group respectfully. In his AR10 the first round fires well, and the brass shows no over-pressure signs. The next rounds out of the magazine fire and these pieces of brass have primer cratering and mis-shapen extractor marks on their rim. He did not specify if the AR10 groups are good or bad.
He has tried the loads in both guns with and without his Omega 30. The results are the same.
I suggested he shoot some factory rounds and see if the same thing happens.
I have not seen the brass myself, nor shot the guns, so I can’t give first hand observation.
Any ideas? I told him it looks to me like the friend’s hand loads are a bit hot. But I do not understand why the first round out of the AR10 does not show the signs.
He has a bolt gun and AR10, both in 308 win. He has some handloads from a friend.
In his bolt gun they fire fine and group respectfully. In his AR10 the first round fires well, and the brass shows no over-pressure signs. The next rounds out of the magazine fire and these pieces of brass have primer cratering and mis-shapen extractor marks on their rim. He did not specify if the AR10 groups are good or bad.
He has tried the loads in both guns with and without his Omega 30. The results are the same.
I suggested he shoot some factory rounds and see if the same thing happens.
I have not seen the brass myself, nor shot the guns, so I can’t give first hand observation.
Any ideas? I told him it looks to me like the friend’s hand loads are a bit hot. But I do not understand why the first round out of the AR10 does not show the signs.