Patent ID: 6523475
Filing Date: 2003-02-25
Classification: F41A,F42B

Abstract:
A firearm cartridge, comprising:a case for housing a propellant, said propellant having an ignition temperature and, when ignited, a flame front, the casing having, an aft end, a straight-walled portion connected to the aft end and defining a base cavity having an interior base diameter, a shoulder connected to the straight-walled portion, wherein the shoulder has a shape defined by an ellipsoid or paraboloid configuration, such that a phantom ellipsoid or paraboloid overlays the shoulder and is centered along a longitudinal axis of the case, a neck connected to the shoulder and having an interior neck diameter, wherein the interior base diameter is approximately at least twice the interior neck diameter; and a bullet at least partially nested within the neck, and wherein the shoulder shape reflects and focuses a shockwave to a focus point disposed along the longitudinal axis and away from the bullet base.