.270 British

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.270 British
Place of originUnited Kingdom
Production history
Bullet diameter7.04 mm (0.277 in)
Rim diameter11.3 mm (0.44 in)
Case length46 mm (1.8 in)
Overall length62.3 mm (2.45 in)
Ballistic performance
Bullet mass/type Velocity Energy
6.48 g (100 gr) 840 m/s (2,800 ft/s) 2,286 J (1,686 ft⋅lbf)

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.[1] The rimless cartridge has a base diameter of 11.3 mm (like the Russian 7.62×39mm) and a case length of 46 mm.[2] The bullet is a standard .270/.277 caliber bullet with a light 100 gr weight with a muzzle velocity of 840 m/s (2,800 ft/s). 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 .270, then ultimately chose the NATO-standard 7.62×51mm cartridge.


  1. ^ Williams, Anthony G. (November 2014). "Assault Rifles and their Ammunition: History and Prospects". Military Guns & Ammunition. Retrieved 30 December 2018.
  2. ^ ".270 Enfield". British Military Cartridges. Archived from the original on 27 September 2013. Retrieved 12 February 2013.
  • Popenker, Maxim; Williams, Anthony G. (2005). Assault Rifle. Crowood. ISBN 978-1861267009.