Centerfire rifle cartridge
| .500/450 Magnum Black Powder Express |
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| Type | Rifle |
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| Place of origin | United Kingdom |
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| Produced | 1870s |
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| Parent case | .500 Black Powder Express |
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| Case type | Rimmed, bottleneck |
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| Bullet diameter | .458 in (11.6 mm) |
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| Neck diameter | .479 in (12.2 mm) |
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| Shoulder diameter | .500 in (12.7 mm) |
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| Base diameter | .570 in (14.5 mm) |
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| Rim diameter | .644 in (16.4 mm) |
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| Case length | 3.25 in (83 mm) |
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| Overall length | 3.91 in (99 mm) |
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| Case capacity | 141.4 gr H2O (9.16 cm3) |
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| Primer type | Kynoch # 40 |
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| Bullet mass/type |
Velocity |
Energy |
| 325 gr (21 g) |
1,950 ft/s (590 m/s) |
2,745 ft⋅lbf (3,722 J) |
| 365 gr (24 g) |
1,875 ft/s (572 m/s) |
2,850 ft⋅lbf (3,860 J) |
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| Source(s): "Cartridges of the World" [1] |
The .500/450 3+1⁄4-inch Magnum Black Powder Express, is a centerfire rifle cartridge developed in Britain.
