Firearms cartridge with rectangular, rounded oblong, or elliptical casing

Abstract

This invention describes ammunition cartridges for pistols or other armaments with propellant-filled casings having a generally square, rectangular, rounded oblong or ellipse-like cross-section. These casings would neck down over a short distance at the front to mate with the bullet. These shapes would allow more rounds of equivalent firepower to be contained in a shorter magazine or smaller diameter revolver cylinder than is possible with standard circular cross-section ammunition.

1 . An ammunition cartridge for rifles, pistols, revolvers, shotguns, or other firearms consisting of a bullet of any desired size, shape and material composition mated to a propellant-filled casing of generally rectangular or square cross-section (taken perpendicular to the longitudinal axis) except for a short section at the front of the casing that necks down to match the bullet, with or without other typical casing features such as an extraction groove or central rear opening for a primer. The rectangular or square section may include rounded corners (fillets) or chamfered corners to facilitate manufacture and/or cartridge feeding.  
   
   
       2 . An ammunition cartridge for rifles, pistols, revolvers, shotguns, or other firearms consisting of a bullet of any desired size, shape and material composition mated to a propellant-filled casing of generally ellipse-like cross-section (taken perpendicular to the longitudinal axis) except for a short section at the front of the casing that necks down to match the bullet, with or without other typical casing features such as an extraction groove or central rear opening for a primer.  
   
   
       3 . An ammunition cartridge for rifles, pistols, revolvers, shotguns, or other firearms consisting of a bullet of any desired size, shape and material composition mated to a propellant-filled casing with a rounded oblong cross-section (taken perpendicular to the longitudinal axis) except for a short section at the front of the casing that necks down to match the bullet, with or without other typical casing features such as an extraction groove or central rear opening for a primer.