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.270 Winchester
The .270 Winchester (or 6.9x64mm) was developed by Winchester Repeating Arms Company in 1923 and unveiled in 1925 as a chambering for their bolt-action Model 54.〔The Complete Reloading Manual for the .270 Winchester, Loadbooks USA, Inc., 2004, pp.13,19〕 The cartridge is a necked down .30-06.
When loaded with a bullet that expands rapidly or fragments in tissue, this cartridge delivers devastating terminal performance.〔Chamberlin FT, Gun Shot Wounds, in Handbook for Shooters and Reloaders, Vol. II, Ackley PO, ed., Plaza Publishing, Salt Lake City, Utah, 1966.〕〔(Scientific Evidence for Hydrostatic Shock )〕〔Shooter’s Bible, Robert F. Scott, p. 28〕
==Description==
The .270 Winchester became a very popular deer and elk cartridge due to the widespread praises of gunwriter Jack O'Connor who used the cartridge for 40 years and espoused its merits in the pages of ''Outdoor Life''.〔Barnes Reloading Manual Number 2 (1997)〕〔Hornady Handbook of Cartridge Reloading, Fourth Edition (1996)〕 It drives an bullet at approximately , later reduced to . The cartridge demonstrated high performance at the time of its introduction and was marketed as being suitable for big game shooting in the range. Two additional bullet weights were soon introduced: a hollow-point bullet for varmint shooting, and a bullet for larger deer, elk and moose in big-game hunting.〔
While not an immediate success, over the succeeding decades and especially in the post-World War II period, the .270 Winchester attained great popularity among gun owners and hunters, ranking it among the most popular and widely used cartridges worldwide. Internationally, firearms manufacturers now offer this chambering in all firearm varieties: bolt-actions, single-shots, lever-actions (such as Browning BLR), pump-actions (such as Remington 7600), autoloaders (such as Remington 7400) and even a few double rifles.〔Speer Reloading Manual Number 12 (1994)〕
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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