The present invention relates generally to steel compositions, methods of manufacturing the compositions and using the compositions to produce rimfire ammunition cartridges. The steel compositions for use in the rimfire cartridges are processed through cold-rolling and annealing steps to create suitable physical properties.

The present invention relates generally to steel compositions for rimfire ammunition cartridges, methods of manufacturing the compositions and using the compositions to produce the rimfire ammunition cartridges. The steel compositions for use in the rimfire cartridges are processed through cold-rolling and annealing steps to create suitable physical properties. The steel compositions can be plated for corrosion resistance following formation of the rimfire cartridges.

The present invention relates generally to steel compositions for rimfire ammunition cartridges, methods of manufacturing the compositions and using the compositions to produce the rimfire ammunition cartridges. The steel compositions for use in the rimfire cartridges are processed through cold-rolling and annealing steps to create suitable physical properties. The steel compositions can be plated for corrosion resistance following formation of the rimfire cartridges.

A cartridge for a firearm, including a projectile, a gas check, a case, a propellant, and a primer configured to ignite the propellant. The propellant is arranged between the gas check and an end surface of the case in which the primer is arranged. The case is crimped against the projectile. The case includes an open end with discrete roll crimps distributed along a circumference of the open end. The case further includes tapered crimps between the roll crimps along the circumference of the open and. The open end alternates between tapered and roll crimps along the entire circumference of the open end. Each of the roll crimps and tapered crimps are crimped to the projectile.

A cartridge for a firearm, including a projectile, a gas check, a case, a propellant, and a primer configured to ignite the propellant. The propellant is arranged between the gas check and an end surface of the case in which the primer is arranged. The case is crimped against the projectile. The case includes an open end with discrete roll crimps distributed along a circumference of the open end. The case further includes tapered crimps between the roll crimps along the circumference of the open and. The open end alternates between tapered and roll crimps along the entire circumference of the open end. Each of the roll crimps and tapered crimps are crimped to the projectile.