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.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).〔''Cartridges of the World 11th Edition'', Book by Frank C. Barnes, Edited by Stan Skinner, Gun Digest Books, 2006, ISBN 0-89689-297-2 p. 476〕 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...(both ) into one generally useless cartridge",〔Barnes, p.273, ".22 CB Cap".〕 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.
American ammunition manufacturers dropped it in the 1940s, while RWS in Germany, Eley-Kinoch in Britain, and Alcan continued to offer it into the 1970s.〔 In some European countries, 6mm Flobert cartridges are still manufactured and sold, as they are used in "flobert revolvers" which are usually unaffected by gun laws (e.g. in Czech Republic and Slovakia, flobert revolvers fall within the same weapon category as air rifles), and they are also used in antique firearms chambered for the .22 short and the .22 long, as most modern ammunition is of a much higher pressure than the old blackpowder cartridges these guns were chambered for.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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