A cartridge case for ammunition may include a rotationally shaped case jacket for receiving a projectile and an annular base piece for receiving a primer and the case jacket. An annular wall of the base piece on the side of the case jacket is conically shaped at least in sections with respect to its axis of rotation. A retaining section of the case jacket on the side of the base piece is adapted in shape thereto so that the retaining section engages at least in sections behind the annular wall for fastening the case jacket and the base piece to one another. A distancing of the base piece and case jacket from each other may be prevented in the direction of the axis of rotation. The conical annular wall and the retaining section may be formed by plastic deformation of the base piece.

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.

A grinding/polishing unit operation for rendering a mirror finish and precise tolerance to the base of an ammunition article. A diamond wheel is used in a live tooling operation where the diamond wheel has a mating profile to the base to be ground/polished. Bases can be prepared from bar stock or pre-existing bases can be treated to enhance magazine loading ease, ejection ease post firing and a reduction in the tendency for spent propellant residue from accreting on the bases. Several embodiments for the unit operation are disclosed.

A grinding/polishing unit operation for rendering a mirror finish and precise tolerance to the base of an ammunition article. A diamond wheel is used in a live tooling operation where the diamond wheel has a mating profile to the base to be ground/polished. Bases can be prepared from bar stock or pre-existing bases can be treated to enhance magazine loading ease, ejection ease post firing and a reduction in the tendency for spent propellant residue from accreting on the bases. Several embodiments for the unit operation are disclosed.

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.

Ammunition cartridge comprising a rigid casing including a tubular sleeve and a base closing an end of the casing, a projectile mounted at another end of the casing, a propellant charge contained inside the casing, and an ignition device. The ignition device comprises an ignition charge arranged to ignite the propellant charge at a point of ignition distal from the base and proximal the projectile.

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 metal injection molded ammunition cartridge comprising a metal injection molded bottom portion comprising a primer recess in communication with a primer flash hole that extends into a propellant chamber and a metal injection molded body extending form the metal injection molded bottom portion.