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.338 Winchester Magnum
The .338 Winchester Magnum is a caliber, belted, rimless, bottlenecked cartridge introduced in 1958 by Winchester Repeating Arms. It is based on the blown-out, shortened .375 H&H Magnum. The is the caliber at which medium-bore cartridges are considered to begin. The .338 Winchester Magnum is the first choice among professional grizzly and brown bear guides in Alaska to back up clients where a powerful stopping caliber is required on charging bears.〔(【引用サイトリンク】title=Firearms Defense Bears )〕 It is also the most popular medium-bore cartridge in North America〔(【引用サイトリンク】url=http://www.norma.cc/content.asp?Typ=59&Lang=2&DocumentID=296&Submeny=4&Rubrik=Calibers&Title=338+Winchester )〕 and has the most widely available choice in rifles among medium bore rifles. The action length is the same as a 30-06 and most major rifle manufacturers in the United States chamber rifles for the cartridge including the semi-automatic Browning BAR Mk II Safari making it a very powerful combination against charging dangerous game.〔(【引用サイトリンク】title=Chuck Hawks 338 Win Mag )〕〔(【引用サイトリンク】title=Rifles Dangerous Game )〕 The cartridge was intended for larger North American big-game species and has found use as for the hunting of thin-skinned African plains-game species.〔
==Cartridge history==
The .338 Winchester Magnum traces its heritage to the experiments conducted by Charles O’Neil, Elmer Keith and Don Hopkins with cartridges firing bullets in the late 1940s. The use of bullets may seem odd today but at the time this was the standard diameter of European .33 caliber bullets which were more common than the diameter bullets used in cartridges such as the .33 Winchester. Furthermore, the were available in heavier weights than the bullets. O’Neil, Keith and Hopkins experiments lead to the creation of the .333 OKH, which was based on the .30-06 Springfield case necked up to accept .33 caliber bullets and the .334 OKH which used a shortened .375 H&H Magnum necked down to accept the same bullets.
The .338 Winchester Magnum was introduced in 1958 together with the .264 Winchester Magnum and the .458 Winchester magnum; all of which used a common case design based on the .375 H&H Magnum case blown out and shortened to much like the .334 OKH. When the cartridge was introduced, Winchester offered a at , a at and a at . Sometime later, Winchester introduced the Winchester Model 70 Alaskan chambered for the cartridge. This chambering left little doubt that the cartridge was intended for big heavy dangerous game.
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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