| 翻訳と辞書 |
| 7mm Remington Magnum ： ウィキペディア英語版 |
7mm Remington Magnum
The 7mm Remington Magnum rifle cartridge was introduced as a commercially available round in 1962, along with the new Remington Model 700 bolt action rifle. It is a member of the belted magnum family that is directly derived from the venerable .375 H&H Magnum.〔Speer Reloading Manual〕 The original purpose of the belted magnum concept taken from the .300 H&H and .375 H&H, was to provide precise control of the head-space, since the sloping shoulders, while easing cartridge extraction, provided poor head-spacing. Improved cartridge extraction reliability is desirable while hunting dangerous game, which would be of concern when needing a fast follow up shot. The 7mm Rem is based on the commercial Winchester .264 Win Mag, .338 Win Mag, and .458 Win Mag, which were based on the same belted .300 H&H and .375 H&H cases, trimmed to nearly the same length as the .270 Wby Mag.〔
On its introduction, the 7mm Rem. Mag. substantially usurped the market share held by the .264 Winchester Magnum, which went into sharp decline in popularity and sales after 1962.〔(.264 Win Mag data from Accurate )〕 Maximum pressure is set by SAAMI at 61,000 PSI.〔 52,000 CUP 〔Speer Reloading Manual # 10 & Hornady Handbook of Cartridge Reloading 3rd Edition〕
Remington has recently offered Managed Recoil ammunition for achieving reduced recoil when shooting and for generating less meat damage when hunting smaller game.
==Design==
The 7mm Remington Magnum offers ballistics better than the .30-06 Springfield with bullet weights of 175 grains and less, one of the more popular loads being a 160 grain spitzer loaded to . This is due both to the higher muzzle velocity of the magnum compared to the Springfield and that .284 diameter bullets tend to have better ballistic coefficients than .308 diameter bullets of comparable mass. It is arguable that the 7 mm Remington Magnum offers marginally better ballistics with 175 grain bullets, the heaviest bullet commonly used in the caliber. The .30-06 Springfield can, however, be loaded with heavier bullets up to 220 grains.
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「7mm Remington Magnum」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|