FIRE ARM CARTRIDGE AND METHOD OF MAKING

摘要

A casing (220) for use in a cartridge for a firearm comprises a sleeve (222) and attached base (224). The sleeve has cylindrical portion with a mouth for holding a bullet and an opposing bulkhead (226) from which extends a nipple (228). A lip (234) that radially decreases in thickness and has curved surface portions forms a first seal region (41). Preferably a second seal zone (39) is near the bulkhead. A bulkhead (226) comprises a circumferential wave or ridge (250). A sleeve is preferably made of austenitic stainless steel and has differential hardness and magnetic properties along the sleeve length, with a least-hardness nipple.