| .450/400 31⁄4 inch Black Powder Express |
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Drawing of .360, .450/400 & .450 Black Powder Express cartridges |
| Type | Rifle |
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| Place of origin | United Kingdom |
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| Designed | 1880s |
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| Parent case | .450 Black Powder Express |
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| Case type | Rimmed, bottleneck |
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| Bullet diameter | .405 in (10.3 mm) |
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| Neck diameter | .432 in (11.0 mm) |
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| Shoulder diameter | .502 in (12.8 mm) |
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| Base diameter | .544 in (13.8 mm) |
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| Rim diameter | .615 in (15.6 mm) |
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| Rim thickness | .040 in (1.0 mm) |
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| Case length | 3.25 in (83 mm) |
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| Overall length | 3.85 in (98 mm) |
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| Primer type | Kynoch # 40 |
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| Bullet mass/type |
Velocity |
Energy |
| 270 gr (17 g) Lead |
1,850 ft/s (560 m/s) |
2,050 ft⋅lbf (2,780 J) |
|
Test barrel length: 26 inches (660 mm)
Sources: Barnes & Kynoch. |
| .450/400 23⁄8 inch Black Powder Express |
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| Case length | 2.375 in (60.3 mm) |
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| Bullet mass/type |
Velocity |
Energy |
| 270 gr (17 g) Lead |
1,650 ft/s (500 m/s) |
1,630 ft⋅lbf (2,210 J) |
|
| Source: Barnes. |
The .450/400 Black Powder Express cartridges were black powder rifle cartridges introduced in the United Kingdom in the 1880s.