Type Rifle
Place of origin Australia
Production history
Designed 1940s
Parent case .303 British
Case type Rimmed, bottleneck
Bullet diameter 0.257 in (Bad rounding hereScript error mm)
Neck diameter 0.290 in (Bad rounding hereScript error mm)
Shoulder diameter 0.412 in (Bad rounding hereScript error mm)
Base diameter 0.460 in (Bad rounding hereScript error mm)
Rim diameter 0.540 in (Bad rounding hereScript error mm)
Rim thickness .064 in (Bad rounding hereScript error mm)
Case length 2.185 in (Bad rounding hereScript error mm)
Overall length 2.85 in (Bad rounding hereScript error mm)
Case capacity 50.86 gr H2O (3.306 cm³)
Rifling twist 1-12 inches
Primer type Large rifle


Ballistic performance
Bullet weight/type Velocity Energy
87 gr (Bad rounding hereScript error g) SP3,010 ft/s (Bad rounding hereScript error m/s)1,750 ft·lbf (Bad rounding hereScript error J)
100 gr (Bad rounding hereScript error g) HPBT2,800 ft/s (Bad rounding hereScript error m/s)1,740 ft·lbf (Bad rounding hereScript error J)
117 gr (Bad rounding hereScript error g) SP2,800 ft/s (Bad rounding hereScript error m/s)1,740 ft·lbf (Bad rounding hereScript error J)
Test barrel length: 24
Source(s): Reload Bench [2]

The .303/25, sometimes known as the .25/303 is a wildcat centrefire rifle cartridge, based on the .303 British, necked down to fire a .257 projectile, originating in Australia in the 1940s as a cartridge for sporterised rifles, particularly on the Lee Enfield action, similar versions also appeared in Canada around the same time.[3]


The .303/25 was very popular for a number of reasons, one being that the .25 caliber was better suited to small game than the .303, the rifles were cheap and plentiful and in New South Wales ownership of military cartridges was severely restricted. Several versions existed but most were simply necked down and remained full length. Although Lee Enfields were the most common, conversion of other rifles mostly suited to rimmed cartridges such as P14 Enfield, Martini Enfield, 1885 and 1895 Winchesters were often seen, as well as 98 and 96 Mausers.[4]

Loaded ammunition and brass was produced by the Super Cartridge Company, Riverbrand, ICI and Sportco, some using new Boxer primed cases, others using military Berdan primed cases. Cases can be formed simply by necking down .303 British brass available from Remington, Federal, Winchester, Sellier & Bellot and others. Reloading dies are made by most larger manufacturers, like RCBS, Lyman, CH[5] and Simplex.[6]

See alsoEdit


  1. Donnelly, John J., Handloaders Manual of Cartridge Conversions, p223
  2. Script error
  3. Barnes, Frank C., Cartridges of the World, 7th Edition, p173
  4. Barnes, Frank C., Cartridges of the World, 10th Edition, p473
  5. Script error
  6. Jansa Arms Co - Australia

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