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From my limited knowledge on the subject ...
I would think it would be too expensive to machine brass from solid stock. As others have said .... brass that we use today is stamped out of solid sheet stock. The stretching action of the press helps to stress harden the walls and neck of the cartridge.
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Admiral Isoroku Yamamoto - “You cannot invade the mainland United States. There would be a rifle behind each blade of grass.”
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