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.577 Nitro Express
The .577 Nitro Express (14.9×76mmR) is a rimmed cartridge in the Nitro Express series of big-game hunting ammunition. It is also known as the .577 Nitro Express 3" and there is a variant called the .577 Nitro Express 2.75" (14.9×70mmR). The .577 is notable as the standard caliber of professional ivory hunters in the 19th and early 20th centuries.
==History==
The .577 Nitro Express was descended from the .577 Black Powder Express, a cartridge invented by Samuel Baker who had Holland & Holland build him an express rifle in this caliber. It began as a black powder round, and then became a smokeless round.〔 It fires a 750-grain bullet (about 48.6 grams) at a muzzle velocity of around 2050 feet per second (625 m/s). The 2.75 in. version, intended to duplicate the black powder version, launches a 650-grain bullet at more than , depending on the type of powder and amount used.
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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