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.700 Nitro Express
The .700 Nitro Express (17.8×89mmR) is a big game rifle cartridge made by Holland & Holland, London, England. It was developed in 1988 by Jim Bell and William Feldstein and built by H&H. Feldstein had tried unsuccessfully to get H&H to build a .600 Nitro Express for him, but they had already ceased production. However, when Bell and Feldstein produced the entirely new .700 Nitro Express cartridge, they were able to attract the interest of H&H, which was looking for a new big-bore cartridge. After production began, the backlog of orders was so great that it continued to 2007 and H&H restarted the production of .600 Nitro Express guns. 〔 ''Cartridges of the World 11th Edition'', Book by Frank C. Barnes, Edited by Stan Skinner, Gun Digest Books, 2006, ISBN 0-89689-297-2 pp. 406, 409〕
==Specifications==
In many respects this cartridge parallels the .600 Nitro Express. It is essentially a scaled-up version of that cartridge, but is somewhat more powerful, and fires a heavier 1000-grain (64.8 g) bullet. The case itself is a completely new case, not simply another case resized. Double rifles are extremely expensive, selling upwards of $260,000 USD in 2015, and have generally been replaced by repeater-rifles using rounds such as the .458 Winchester.
Single factory loaded .700 Nitro cartridges are available, typically at $100 USD each, although they have been sold on the internet for as little as $50 USD. .700 Nitro cases, like those of other big bore cartridges, can be hand reloaded, drastically reducing the cost.
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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