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Standard Mk VII .303 inch cartridge for Lee-Enfield rifle[1]

The British 0.303 Cartridge (metric calibre 7.7 x 56R) is a rifle calibre bullet with a rim diameter of 0.540in and a body diameter of 0.460in.


There are three main varieties -

Mk2 ball weighing 13.9 grams with a muzzle velocity of 610 m/sec.

Mk7 ball weighing 11.27 grams with a muzzle velocity of 744 m/sec.

Mk 8 'boat tail' ball for Vickers Machine Gun, weighing 11.27 grams with a muzzle velocity of 777 m/sec. It was also used in the Bren Gun.[2]


  2. Williams, Anthony G. Rapid Fire - The Development of Automatic Cannon, Heavy Machine Guns and their Ammunition for Armies, Navies and Air Forces. Airlife Publishing. 2000. ISBN 1-84037-122-6

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