Mills take a factory case and compare it to a fired one. I agree with the others that it looks to be whats called an improved 375. P.O. Ackley did this to a number of cartridges. I once had a 257 Roberts AI and have a 7X57 AI. You can shoot factory 375 ammo and the shoulder will be fire formed to the improved version. This modification eliminates any collector value however.
I have a great plinking load using a 200 gr bullet and 4227 for my Pre 64 M70. It will flatten a deer
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There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter...Earnest Hemingway
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