CARTRIDGE FOR SMALL ARMS Russian patent published in 2012 - IPC F42B5/00 F42B5/26 F42B5/28 

FIELD: weapons and ammunition.

SUBSTANCE: invention relates to ammunition, particularly, to design of cartridge case. Cartridge comprises case with primer, propellant charge and bullet. Case body comprises bottom, taper case, shoulder and mouth. Strain compensator is made on case body outer surface, in the area of possible body fracture or jam in chamber. Generatrix of strain compensator is composed of a combination of straight parallel lines or lines inclined at 0.0-3.0° to cartridge lengthwise axis and radius convex or concave lines. Said generatrix creates a gap between conditional ruler and compensator edges. Compensator length makes 0.2-0.9 of case body length.

EFFECT: reliable extraction.

3 cl, 3 dwg