.22 CB

.22 CB Cap (Conical Ball Cap, known as a 6mm Flobert in Europe) is a variety of .22 caliber rimfire ammunition which has a very small propellant charge (usually no gunpowder, just the primer), resulting in a low muzzle velocity of between 350 and 853 ft/s (110 to 260 m/s). This is similar to the muzzle velocity produced by a low to mid-power .22 pellet gun, however the bullet from a .22 CB cartridge is significantly heavier than a typical airgun pellet and therefore carries more energy.

History

Designed to be a cross between the .22 BB and .22 Short, and first catalogued in around 1888 (though probably first made before that), it "managed to combine about all the disadvantages...[of both] into one generally useless cartridge", being no more accurate than either while being noisier than the .22 BB Cap, and also penetrating much deeper requiring a backstop as strong as the .22 Short, and therby negating the BB Cap's advantages for shooting indoors. However, the cartridge found use in Europe in cheap rifles meant for short range pest control well into the twentieth century.