Patent ID: 8522684
Filing Date: 2013-09-03
Classification: F42B

Abstract:
1. A base insert for a cartridge case comprising: a base end having a lip and a groove proximate the lip and having a primer pocket defined in the base end; an insert end having a base wall and a cylindrical wall extending there from, said base wall and cylindrical wall defining a powder fill pocket; wherein said base wall has a flash hole disposed therein and an inner surface facing the powder fill pocket; wherein said cylindrical wall has an inner surface intersecting with the inner surface of the base wall and an outer surface defining the outer circumference of the base insert; wherein the intersection of said inner surface of the base wall and the inner surface of the cylindrical wall is curved, while the outer surface of the insert end is not curved; and wherein the base wall includes an annular flashhole cutoff pit disposed therein, wherein the flashhole cutoff pit has at least one surface that is substantially perpendicular to the inner surface of the base wall.