| .303/.25
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| Type | Rifle |
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| Place of origin | Australia |
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| Designed | 1940s |
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| Parent case | .303 British |
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| Case type | Rimmed, bottleneck |
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| Bullet diameter | 0.257 in (6.5 mm) |
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| Neck diameter | 0.290 in (7.4 mm) |
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| Shoulder diameter | 0.412 in (10.5 mm) |
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| Base diameter | 0.460 in (11.7 mm) |
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| Rim diameter | 0.540 in (13.7 mm) |
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| Rim thickness | .060 in (1.5 mm) |
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| Case length | 2.185 in (55.5 mm) |
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| Overall length | 2.85 in (72 mm) |
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| Case capacity | 50.86 gr H2O (3.296 cm3) |
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| Rifling twist | 1-12 inches |
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| Primer type | Large rifle
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| Bullet mass/type |
Velocity |
Energy |
| 87 gr (6 g) SP |
3,010 ft/s (920 m/s) |
1,750 ft⋅lbf (2,370 J) |
| 100 gr (6 g) HPBT |
2,800 ft/s (850 m/s) |
1,740 ft⋅lbf (2,360 J) |
| 117 gr (8 g) SP |
2,800 ft/s (850 m/s) |
2,030 ft⋅lbf (2,750 J) |
|
| Test barrel length: 24 |
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.
