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.270 British : ウィキペディア英語版 | .270 British
The .270 British (or .270 Enfield) is an experimental intermediate rifle cartridge that was developed by the British at the same time as the .280 British as a potential successor to the .303 British cartridge.〔http://www.quarryhs.co.uk/Assault.htm〕 The rimless cartridge has a base diameter of 11.3 mm (like the Russian 7.62×39mm) and a case length of 46 mm.〔http://home.wanadoo.nl/cartridges/270_enfield.htm〕 The bullet is a standard .270/.277 caliber bullet with a light 100 gr weight with a muzzle velocity of . It was not good at long range, but its slender case had the potential to fire a heavier bullet at a relatively high velocity. It was optimized for shorter ranges, while the .280 favored long-range performance to try to meet U.S. requirements. The cartridge was not adopted, the British initially focused development on the .280, then ultimately chose the NATO-standard 7.62x51 cartridge. ==References==
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