| .577 Black Powder Express (3-inch) |
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| Type | Rifle |
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| Place of origin | United Kingdom |
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| Designed | 1870s |
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| Case type | Rimmed, straight |
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| Bullet diameter | .584 in (14.8 mm) |
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| Neck diameter | .608 in (15.4 mm) |
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| Base diameter | .660 in (16.8 mm) |
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| Rim diameter | .728 in (18.5 mm) |
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| Rim thickness | .052 in (1.3 mm) |
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| Case length | 3 in (76 mm) |
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| Primer type | Kynoch # 40 |
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| Bullet mass/type |
Velocity |
Energy |
| 570 gr (37 g) Lead copper tubed |
1,725 ft/s (526 m/s) |
3,770 ft⋅lbf (5,110 J) |
| 610 gr (40 g) Lead solid |
1,650 ft/s (500 m/s) |
3,690 ft⋅lbf (5,000 J) |
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Test barrel length: 28
Source(s): Barnes, Kynoch and Taylor. |
| .577 Black Powder Express (23⁄4-inch) |
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| Bullet mass/type |
Velocity |
Energy |
| 520 gr (34 g) Lead copper tubed |
1,725 ft/s (526 m/s) |
3,440 ft⋅lbf (4,660 J) |
| 560 gr (36 g) Lead solid |
1,650 ft/s (500 m/s) |
3,380 ft⋅lbf (4,580 J) |
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| Source(s): Taylor. |
The .577 Black Powder Express is a series of black powder cartridges of varying lengths including 21⁄2-inch, 23⁄4-inch, 3-inch and 31⁄4-inch.