| .401 Winchester Self-Loading |
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.401 Winchester Self-Loading (Center) with .308 Win (left) and .45-70 (right). |
| Type | Rifle |
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| Place of origin | USA |
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| Designer | Winchester Repeating Arms Company |
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| Case type | Semi-rimmed, straight |
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| Bullet diameter | .4065 in (10.33 mm) |
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| Neck diameter | .428 in (10.9 mm) |
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| Base diameter | .429 in (10.9 mm) |
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| Rim diameter | .457 in (11.6 mm) |
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| Rim thickness | 0.05 in (1.3 mm) |
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| Case length | 1.50 in (38 mm) |
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| Overall length | 2.005 in (50.9 mm) |
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| Rifling twist | 1 in 14 in (360 mm) |
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| Primer type | Large rifle |
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| Maximum pressure | 37,000–39,000 psi (260–270 MPa) |
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| Bullet mass/type |
Velocity |
Energy |
| 200 gr (13 g) |
2,141 ft/s (653 m/s) |
2,037 ft⋅lbf (2,762 J) |
| 250 gr (16 g) |
1,875 ft/s (572 m/s) |
1,952 ft⋅lbf (2,647 J) |
|
Test barrel length: 20 inches (510 mm)
Source(s): Whelen, Townsend. The American Rifle. Century Co. 1918 p. 266 |
The .401 Winchester Self-Loading (.401SL / .401WSL) or 10.33x38mmSR is an American rifle cartridge.
