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・ .500 A-Square
・ .500 Black Powder Express
・ .500 Jeffery
・ .500 Linebaugh
・ .500 Maximum
・ .500 Nitro Express
・ .500 No. 2 Express
・ .500 S&W Magnum
・ .500 S&W Special
・ .500 Wyoming Express
・ .500/450 Nitro Express
・ .500/465 Nitro Express
・ .505 Gibbs
・ .510 DTC EUROP
・ .510 Whisper
.55 Boys
・ .56-56 Spencer
・ .577
・ .577 Black Powder Express
・ .577 Nitro Express
・ .577 Snider
・ .577 Tyrannosaur
・ .577/450 Martini–Henry
・ .577/500 Magnum Nitro Express
・ .585 Gehringer
・ .585 Nyati
・ .600 Nitro Express
・ .600 Overkill
・ .70-150 Winchester
・ .700 Nitro Express


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.55 Boys : ウィキペディア英語版
.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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