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Seems to me like the chamber of the rifle those came from has... pitting I guess... on the neck portion of the chamber. Probably shot a bunch of corrosive ammo and didn't get cleaned properly.
Its definitely going to distort the brass and while resizing would probably fix it I wouldn't take a chance. But the bigger concern is the rifle that has a clearly damaged chamber. Maybe try and track down who did it and let them know they might have a bomb on their hands.
Its definitely going to distort the brass and while resizing would probably fix it I wouldn't take a chance. But the bigger concern is the rifle that has a clearly damaged chamber. Maybe try and track down who did it and let them know they might have a bomb on their hands.