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The .401WSL or .401SL (also called .401 Winchester Self-Loading) is an American rifle cartridge.

401 Winchester Self-Loading

  • Type Rifle
  • Place of origin USA

Production history

  • Designer Winchester Repeating Arms Company


  • Bullet diameter .4065 in (10.33 mm)
  • Neck diameter .428 in (10.9 mm)
  • Base diameter .429 in (10.9 mm)
  • Rim diameter .457 in (11.6 mm)
  • Rim thickness 0.05 in (1.3 mm)
  • Case length 1.50 in (38 mm)
  • Overall length 2.005 in (50.9 mm)
  • Rifling twist 1 in 14
  • Primer type Large rifle
  • Maximum pressure 37,000 to 39,000 PSI

Ballistic performance

Bullet mass/type Velocity Energy
200 gr (13 g) 2,141 ft/s (653 m/s) 2,037 t⋅lbf (2,762 J)
250 gr (16 g) 1,875 ft/s (572 m/s) 1,952 ft⋅lbf (2,647 J)

Winchester introduced the .401WSL in the Winchester '10 self-loading rifle as a supplement to the Winchester '07 and the .351SL in their offering of hi-power, self-loading rifles. The only chambering available in the Winchester Model 1910, the .401SL, was used by France, Russia, and American company security forces in the First World War.

The .401 WSL proved convincing enough for both deer and other massive game at ranges under 150 yards. Winchester and other ammunition manufacturers offered both 200gr and 250gr bullet weights as factory loadings. With extra available detachable magazines holding 4-rounds each, the Model '10, could provide lots of firepower for the big-game hunter.

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