.270 British

.270 British
Type	Rifle
Place of origin	United Kingdom
Production history
Designed	post-WWII
Specifications
Bullet diameter	7.04 mm (0.277 in)
Rim diameter	11.3 mm (0.44 in)
Case length	46 mm (1.8 in)
Overall length	62.3 mm (2.45 in)
Ballistic performance
Bullet weight/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.

References

1. http://www.quarryhs.co.uk/Assault.htm
2. http://home.wanadoo.nl/cartridges/270_enfield.htm

Popenker, Maxim; Williams, Anthony G. (2005). Assault Rifle. Crowood. ISBN 978-1861267009.