"CALIBRE BUTTERFLY" BULLET AND CARTRIDGE FOR SMOOTH-BORE WEAPON Russian patent published in 2012 - IPC F42B5/00 

FIELD: weapons and ammunition.

SUBSTANCE: bullet comprises a head and a tail parts. The bullet is arranged as monolithic in the form of a solid of revolution having a stepped-spindle shape. The head part is formed by serial coupling of a hemispherical blunted head fairing, a cylindrical bullet body and a cone stop. The tail part comprises a support-obturator bullet belt adjoining the specified cone stop, a stabiliser having a central rod with a reverse cone and three empennage blades installed in peripheral areas of the reverse cone and the central rod at the angle of 0-10° to the longitudinal axis of the bullet. The diameter of the cylindrical body of the head part makes 0.75-0.95 of the diameter of the weapon barrel channel choke. The bullet length makes 1.9-2.2 of the diameter of the cylindrical bullet body. The diameter of the support-obturator bullet belt makes 1.0-1.003 of the barrel channel diameter. The empennage length and swing of the stabiliser are equal to the diameter of the barrel channel. The diameter of the central rod of the bullet stabiliser makes 0.3 of the barrel channel diameter. The alignment system of the bullet is formed by the cylindrical surface of the support-obturator belt and peripheral cylindrical surfaces of the stabiliser blades. A cartridge comprises an ignition facility, a powder charge and a missile equipped with a support-obturator system, a shock-absorbing system and a calibre bullet placed in a cartridge case. The bullet in the cartridge is the above calibre bullet.

EFFECT: improved accuracy and close grouping of shots.

2 cl, 2 dwg