Cartridge base and plastic cartridge case assembly for ammunition cartridge

Abstract

A cartridge for ammunition has a base with an axial end section. An annular wall extends from the enlarged outer peripheral lip section to an opposite end. The axial end section has a primer cavity therein and a radially outwardly extending peripheral extraction lip. An annular ledge is axially positioned at an inner end of said primer cavity and radially extends inwardly from said annular wall. A passage has a reduced diameter compared to the primer cavity and extends through the annular ledge. A main charge cavity is at an opposite side of the ledge from the primer cavity. A knurl section is on an outer surface of said cylindrical wall. A cartridge case is attached to the base about said knurl section.

1 . A cartridge for ammunition, said cartridge comprising:
 a base having an axial end section having a primer cavity therein and a radially outwardly extending peripheral extraction lip;   an annular wall extending from said enlarged outer peripheral lip section to an opposite end;   an annular ledge axially positioned at an inner end of said primer cavity and radially extending inwardly from said annular wall;   a passage having a reduced diameter compared to said primer cavity and extending through said annular ledge;   a main charge cavity at an opposite side of said ledge from said primer cavity and within the confines of the annular wall;   a knurl section on an outer surface of said annular wall;   said knurl section having canted grooves thereon; and   a cartridge case attached to the base about said knurl section.   
     
     
         2 - 26 . (canceled)