Cartridge for ar-15 pattern rifles

Abstract

A cartridge for use in AR-15 pattern rifles may comprise a case having a body and a neck. The body may have a maximum diameter of about 0.4474 inches. The case may have a length of about 1.700 inches. The cartridge may have a total length of about 2.050 inches. The body diameter may taper from about 0.4474 inches to about 0.4440 inches along a portion of its length. The body diameter may further taper to about 0.4103 inches near the neck. The neck may have an angle of about 35 degrees relative to a longitudinal axis of the cartridge. A portion of the body adjacent to the neck may have an angle of about 20 degrees relative to a longitudinal axis of the cartridge. The cartridge may further comprise an extraction groove near a base of the cartridge. The extraction groove may have a width of about 0.033 inches. A portion of the case near a base may have a length of about 1.000 inches. The case may be formed from brass. The cartridge may further comprise a propellant and a projectile loaded in the case. The propellant and projectile may be selected to provide improved muzzle velocity and kinetic energy compared to 400 Legend and 450 Bushmaster cartridges.

Dependencies are inferred from the claim text.