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Concaved, you are not going to believe this, vacuum, the bullet started down the barrel without enough pressure to force the bullet out, when the bullet got to the end of its travel a vacuum was created, with a choice, the bullet could have returned or the vacuum could have collapsed the primer.
Then there was the time pressure escaped through a punctured primer with no place to go, it was one of those deals where the case fit the chamber at the shoulder and at the case head in front of the bolt face, the escaping gas had no place to go but back through the punctured primer hole, the high pressure captured gas could not escape fast enough so the primer collapsed from the center out, and that the story about the primer with the concaved appearance, AND! that is my story and I am sticking to it, as per ALEX HAWKINS.
F. Guffey
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