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.55 Boys
The .55 Boys (13.9×99mmB in metric) is an anti-tank cartridge used by the United Kingdom in World War II. It was only used in the Boys Anti-Tank Rifle. ==Design==
The .55 Boys is basically a .50 BMG cartridge necked up to accept a .55 caliber bullet and with a belt added to its case. Average muzzle velocity is 2,495 fps for the AP MK I, one of the most common variants of this cartridge. It was designed to be an anti-tank cartridge, which, as a concept, was started with the World War I–era 13.2mm TuF round. However, its performance is quite low compared to other anti-tank rounds of the time, such as the 7.92×94mm Patronen and the 14.5×114mm rounds.〔Ammo Encyclopedia, 2nd Edition by Michael Bussard, pg. 563〕 This led to it being obsolete almost immediately after the United Kingdom entered World War II.
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「.55 Boys」の詳細全文を読む
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