English sporting cartridge from 1919, used for long range shooting. The cartridge has a groove and rim, is 3.5 mm longer and has a larger diameter. The bullet was not manufactured outside England and production ceased in 1930. The 11.2 g projectile has a muzzle velocity of 930 m/sec, on the right is the 7.92 x 57 bullet.
Source. Malimánek "Náboje do ručních palných zbraní" Naše vojsko Praha 1998 - A. Andersen, V. Andresen, T. Stromstad "Cartridge Cases", Norway 1995.
URL : https://www.valka.cz/303-Magnum-t125226#425426
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