Patent ID: 7841279
Filing Date: 2010-11-30
Classification: F42B

Abstract:
1. A cartridge for a firearm, comprising: a cartridge case and a propellant contained in said cartridge case, said cartridge case further defining a recess extending forwardly from a rearward end of said case to an end wall adjacent to said propellant; a projectile at a forward end of said cartridge case; a primer support member in said recess adjacent said rearward end of said cartridge case, said primer support member including a pocket extending therein that opens at a forward end of said primer support member, said primer support member further including a flange extending around said pocket at said forward end of said primer support member and a groove in an outer surface of said primer support member rearwardly of said flange, said groove permitting propellant gases generated upon firing said cartridge to seal said flange of said primer support member against said cartridge case while said groove is located in said recess to collect any propellant gases passing through said seal between said primer support member and said cartridge case; and a primer in said pocket for holding priming composition between said primer support member and said propellant.