| .303/.22 |
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| Type | Rifle |
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| Place of origin | Australia |
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|
| Designed | 1930s |
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| Variants | Wasp, Varment R., Sprinter, Shannon, Epps, Rocket |
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|
| Parent case | .303 British |
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| Case type | Rimmed, bottleneck |
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| Bullet diameter | 0.224 in (5.7 mm) |
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| Neck diameter | 0.260 in (6.6 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 | .064 in (1.6 mm) |
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| Case length | 2.185 in (55.5 mm) |
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| Overall length | 2.8 in (71 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[1] |
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|
|
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| Bullet mass/type | Velocity | Energy |
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| 45 gr (3 g) HP | 3,500 ft/s (1,100 m/s) | 1,224 ft⋅lbf (1,660 J) | | 50 gr (3 g) SP | 3,250 ft/s (990 m/s) | 1,173 ft⋅lbf (1,590 J) | | 55 gr (4 g) SP | 3,050 ft/s (930 m/s) | 1,136 ft⋅lbf (1,540 J) |
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| Source(s): ADI[2] |
The.303/22, sometimes known as the .22/303, is awildcatcentrefireriflecartridge based on the.303 British, necked down to fire a .224 projectile, originating inAustraliain the 1930s as a cartridge forsporterisedrifles, particularly on theLee–Enfieldaction. Similar versions also appeared inCanadaaround the same time.[3]
