CARTRIDGE FOR SMOOTH-BORE SYSTEMS Russian patent published in 2014 - IPC F42B5/02 

FIELD: weapons and ammunition.

SUBSTANCE: cartridge includes a cylindrical case, a propellant charge, an igniter capsule, a propellant element and a piston. The piston by its cylindrical surface contacts the inner surface of the case. The piston has through holes at an angle of inclination to its horizontal plane for the passage of gases from the propellant charge. The propellant charge is arranged throughout the free volume of the case. The piston is made in the bottom part on the propellant element itself. The diameter of the propellant element in the middle part is smaller than the inner diameter of the case. The propellant element diverges conically in the front part to the piston diameter and is changed over to a cylinder and then to an ogival section.

EFFECT: achievement of a rotational movement of the propellant element in the case at firing.

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