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.38 S&W
The .38 S&W (9×20mmR) is a revolver cartridge developed by Smith & Wesson in 1877 for use in the S&W .38 Single Action. Though similar in name, it is not interchangeable with the later .38 Smith & Wesson Special due to a different case shape and slightly larger bullet diameter.
The British military adopted a loading of this cartridge as the Cartridge, S.A., Revolver Ball, 380 in, MkI .38-200, with the "200" referring to the weight of the bullet in grains. In 1937, this cartridge was replaced in British Service by the Cartridge, S.A., Revolver Ball, 380 in, MkII. The main difference between it and the previous round was that that it had a 178 gn. FMJ bullet.〔
==U.S. variants==
The .38 Colt New Police was Colt's Manufacturing Company's proprietary name for what was essentially the .38 S&W with a flat-nosed bullet.〔
The U.S. .38 S&W Super Police cartridge was nearly identical to the British .38/200 Mk I, using a 200 grain (13 g) lead alloy bullet with a muzzle velocity of 630 ft/s (189 m/s) and a muzzle energy of 176 ft·lbf (239 J), and was supplied by several U.S. manufacturers to the British government as equivalent to the Mk I loading.〔
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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