Firearm barrel having a cartridge chamber

Abstract

The present invention provides a barrel of a firearm, comprising: a barrel bore being defined within said barrel; a cartridge chamber being defined within said barrel from a head face to said barrel bore, said cartridge chamber having a generally tapered internal body wall surface; a cartridge case shoulder support surface; wherein the cartridge case shoulder support surface has a shoulder taper angle of about 30 degrees; and a shoulder transition connecting the cartridge case shoulder support surface to a throat in communication with the barrel bore, wherein the shoulder transition has a radius of circular curve convex segment 138 and a radius of circular curve concave segment 140.

Dependencies are inferred from the claim text.