|
The .25 ACP (Automatic Colt Pistol) (6.35×16mmSR) is a semi-rimmed, straight-walled centerfire pistol cartridge introduced by John Browning in 1905 alongside the Fabrique Nationale M1905 pistol. In more recent years, most pistols available in .25 ACP are also available in a more effective caliber. == Design == The cartridge was designed by John Browning for early blowback pistols that lacked a breech locking mechanism. The cartridge was designed to duplicate the performance of a .22 Long Rifle cartridge, when fired from a 2" barrel. The .25 caliber was the smallest case Browning could use, and utilize primer pocket, and sufficient rim. The greased, coated lead bullet design, standard for the .22 long rifle of the day, was replaced with a copper jacketed round nose profile for more reliable feeding in auto loading pistols. The bullet weight was typically 50 grains, keeping with the sectional density of the 40 grain .22 caliber bullet. The cartridge is of semi-rimmed design meaning that the rim protrudes slightly beyond the diameter of the base of the cartridge so the cartridge can headspace on the rim.〔 *Wilson, R. K. ''Textbook of Automatic Pistols'', p.258. Plantersville, SC: Small Arms Technical Publishing Company, 1943. ISBN 978-0-935632-89-7〕 A recessed extractor groove allows an extractor to grab the cartridge reliably. It is the smallest centerfire pistol round in production, and is commonly chambered in small, so-called "vest pocket" pistols. The .25 ACP achieved widespread use after Colt introduced the Browning-designed Fabrique 1905 vest pocket (sometimes referred to as 1906) to the United States as the Colt Model 1908 Vest Pocket. Though the .25 ACP was designed for semi-automatic pistols, various .25 ACP revolvers were produced in the early twentieth century by Belgian, French, and German gunmakers such as Adolph Frank and Decker.〔http://www.littlegun.be/arme%20allemande/artisan%20c%20d/a%20decker%20walter%20gb.htm〕 In the late twentieth century, Bowen Classic Arms produced a custom Smith & Wesson revolver in .25 ACP.〔Bowen, Hamilton. ''The Custom Revolver''. Privately printed, 2001. ISBN 978-0-9713366-0-5〕 Following World War II, the Italian Lercker machine pistol was chambered for the .25 ACP, but achieved little distribution. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「.25 ACP」の詳細全文を読む スポンサード リンク
|