|Place of origin||England|
|Designer||W.J. Jeffery & Co|
|Case type||Semi-rimmed or rimless, bottleneck|
|Bullet diameter||.312 in (7.9 mm)|
|Neck diameter||.345 in (8.8 mm)|
|Shoulder diameter||.462 in (11.7 mm)|
|Base diameter||.530 in (13.5 mm)|
|Rim diameter||.557 in (14.1 mm)|
|Case length||2.35 in (60 mm)|
|Overall length||3.35 in (85 mm)|
|Source(s): Cartridges of the World.|
The cartridge was designed by Jeffery for target shooting, and was used for some time by the British Match Rifle Committee. The .303 Magnum's case capacity is the same as the .30-06 Springfield, although performance was considered to favour the .303 Magnum. The .303 Magnum had a brief life, only appearing in the Kynoch catalogue until 1930.
The .303 Magnum fires a 174 gr projectile at 2850 fps.
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