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.276 Enfield
The .276 Enfield was an experimental military rifle cartridge developed in conjunction with the Pattern 1913 Enfield (P'13) rifle. Development was discontinued by the onset of World War I.
==Ballistics==
The .276 Enfield was designed with the intent of being more powerful than the .303 British cartridge used in the Lee-Enfield rifles. The Mauser-type action of the Pattern 1913 rifle was very substantial and designed to be stronger than the Lee-Enfield action, to allow for the higher energy .276 cartridge. While the .303 British round has a larger-diameter projectile than the .276 Enfield, the .276 Enfield cartridge case is larger and contains more propellant developing higher chamber pressures and, as such, is more powerful than the .303 British. The .303 Mk VII round, for instance, has a projectile weight of 174 grains and a muzzle velocity of 2,441 ft/s, while the .276 has a projectile weight of 165 grains 〔http://www.ballisticstudies.com/Knowledgebase/.303+British.html〕 and a muzzle velocity of 2,785 ft/s. This is partly due to the slimmer bullet of the .276 Enfield, which was more aerodynamic and designed to travel at faster velocities. The .276 Enfield was designed to be similar in size and performance to other large, powerful military rifle cartridges, like the .30-06 Springfield, 8mm Mauser, 7.5mm Swiss and 7.62x54mmR. The combination of a projectile with a lower sectional density propelled at a higher velocity gave the .276 Enfield better ballistics than the .303 British, and was also rimless to ensure greater reliability in magazine-fed weapons, a problem with the older .303 round. However, the .276 Enfield was not chosen for military service.
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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