PRESSURE-REGULATING COMPOSITE CARTRIDGE WITH GAS EXPANSION ZONE

摘要

A plastic-cased metal-headed ammunition casing for high-powered rifle and cannon cartridges is described in which the plastic case (12) has a pressure regulating baffle (44) or wall in the forward end thereof to regulate and control the development of chamber pressure and directs pressure into a space around the bore of the projectile (10) prior to movement of the projectile. The cartridge is charged with a given charge of powder (38) and the cap or head (14) securely fastened to the rearward portion of the plastic casing. An expandable sleeve (124) may be used to stabilize the head-casing interfit. The head provides sufficient resistance to the residual pressure after firing so that the cartridge can be used in rapid fire automatic weapons.