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From my limited knowledge on the subject ...
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Note: It is not "stress hardening", it is "work hardening". Brass can
only be hardend by "working".
Modern brass cartridge cases are produced with multiple cup and draw dies. As the previous posts have stated, turned cases have been produced on lathes, but the skill and the machinery required makes that process cost prohibitive. Buy drawn cases, conversion from another similar case is a more reasonable solution for obsolete or wildcatting.