A cartridge case for centerfire ammunition may include a rotationally shaped casing sleeve for receiving a projectile as well as propellant charge powder, and a separate rotationally shaped bottom piece which is attached to the casing sleeve and has a closed ignition surface to be faced towards a firing pin for ignition of the centerfire ammunition. The closed ignition surface delimits, on the firing pin side, a receiving chamber for an ignition charge. The casing sleeve may have or support an anvil extending in the direction of the ignition surface into the receiving chamber. The ammunition may have a caliber in the range from, for example, 4.6 to 12.7.

A cartridge case for centerfire ammunition may include a rotationally shaped casing sleeve for receiving a projectile as well as propellant charge powder, and a separate rotationally shaped bottom piece which is attached to the casing sleeve and has a closed ignition surface to be faced towards a firing pin for ignition of the centerfire ammunition. The closed ignition surface delimits, on the firing pin side, a receiving chamber for an ignition charge. The casing sleeve may have or support an anvil extending in the direction of the ignition surface into the receiving chamber. The ammunition may have a caliber in the range from, for example, 4.6 to 12.7.

The present invention provides polymeric ammunition cartridge having a generally cylindrical neck having a projectile aperture at a first end, a shoulder comprising a shoulder top connected to the generally cylindrical neck opposite a shoulder bottom, a nose junction positioned around the shoulder bottom, a skirt connected circumferentially about the nose junction to extend away from the shoulder bottom, wherein the nose junction and the skirt are adapted to mate to a base junction in a cartridge.

The present invention provides a method of making a metal injection molded ammunition cartridge comprising the steps of: providing an ammunition cartridge mold comprising a bottom portion having a primer recess extending into the bottom portion adapted to receive a primer, a flash hole positioned in the primer recess through the bottom surface; side walls extending from the bottom portion to a nose end aperture, wherein a propellant chamber is formed between the nose end aperture and the bottom surface; injecting a metal composition into the ammunition cartridge mold to form a metal injection molded ammunition cartridge; and removing the metal injection molded ammunition cartridge from the ammunition cartridge mold.

The present invention provides a method of making a metal injection molded ammunition cartridge comprising the steps of: providing an ammunition cartridge mold comprising a bottom portion having a primer recess extending into the bottom portion adapted to receive a primer, a flash hole positioned in the primer recess through the bottom surface; side walls extending from the bottom portion to a nose end aperture, wherein a propellant chamber is formed between the nose end aperture and the bottom surface; injecting a metal composition into the ammunition cartridge mold to form a metal injection molded ammunition cartridge; and removing the metal injection molded ammunition cartridge from the ammunition cartridge mold.

The present invention provides a polymer nose for a polymeric ammunition cartridge having a generally cylindrical neck having a projectile aperture at a first end, an outer shoulder surface that extends from the generally cylindrical neck, an outer shoulder angle defined by the outer shoulder surface, an inner shoulder surface on the inside of the polymer nose opposite the outer shoulder surface, an inner shoulder angle defined by the outer shoulder surface, a skirt surface extending from the inner shoulder surface, a skirt angle defined by the skirt surface and a nose junction that extends from the outer shoulder surface to the skirt surface, wherein the nose junction is adapted to mate to a polymer cartridge.

The present invention provides polymeric ammunition cartridges having a generally cylindrical neck having a projectile aperture at a first end, a shoulder comprising a shoulder top connected to the generally cylindrical neck opposite a shoulder bottom, a side wall extending from the shoulder, a groove positioned around the side wall, a skirt connected circumferentially about the groove to extend away from the groove, wherein the groove and the skirt are adapted to mate to a polymer cartridge.

The present invention provides polymeric ammunition cartridge having a generally cylindrical neck having a projectile aperture at a first end, a shoulder comprising a shoulder top connected to the generally cylindrical neck opposite a shoulder bottom, a nose junction positioned around the shoulder bottom, a skirt connected circumferentially about the nose junction to extend away from the shoulder bottom, wherein the nose junction and the skirt are adapted to mate to a base junction in a cartridge.

The present invention provides polymer ammunition cartridge having a generally cylindrical neck having a projectile aperture at a first end, a shoulder comprising a shoulder top connected to the generally cylindrical neck opposite a shoulder bottom, a nose junction positioned around the shoulder bottom, a skirt connected circumferentially about the nose junction to extend away from the shoulder bottom, wherein the nose junction and the skirt are adapted to mate to a base junction in a cartridge.

The present invention provides a chamber reamer used to form a chamber in a firearm wherein the chamber is adapted to fit a multi piece ammunition cartridge comprising: a reamer comprising a reamer profile corresponding to an ammunition cartridge having a reduced neck height comprising: a shortened neck having a projectile aperture, wherein the shortened neck is reduced by 25-100% of the neck height of a standard cartridge neck; a shoulder extending from the shortened neck to a cartridge side wall; and wherein the cartridge side wall extends from the shoulder to the base to form an interior propellant chamber; wherein the base comprises an extraction ring, a primer recess positioned in the base in communication with the propellant chamber through a flash hole that extends from the primer recess into the propellant chamber.