| Metric (mm) | Imperial (in) | |
| Calibre | 12.7 x 81 | .5 |
| Name: | ||
| Case Type: | Rimless, bottlenecked | |
| Bullet Diameter: | 13.05 | |
| Case Length: | 81.2 | |
| Rim Diameter: | 18.30 | |
| Neck Diameter: | 13.70 | |
| Shoulder Diameter: | ||
| Base Diameter: | 18.37 | |
| Total Length: | 107 | |
| Weight: | 80.5 grammes | |
| Primer: | Berdan | |
| Year Introduced: | 1923 | |
| Also known as: |
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| Australia |
| Canada |
| United Kingdom |