.351 Winchester Self-Loading
From left to right: .35 Winchester Self-Loading, .351 Winchester Self-Loading, .45 ACP
Type Rifle
Place of origin USA
Service history
Used by France
United Kingdom
Wars World War I
Production history
Designer Winchester Repeating Arms Company
Bullet diameter 0.352 in (Bad rounding hereScript error mm)
Neck diameter 0.373 in (Bad rounding hereScript error mm)
Shoulder diameter straight
Base diameter 0.377 in (Bad rounding hereScript error mm)
Rim diameter 0.407 in (Bad rounding hereScript error mm)
Rim thickness 0.05 in (Bad rounding hereScript error mm)
Case length 1.375 in (Bad rounding hereScript error mm)
Overall length 1.906 in (Bad rounding hereScript error mm)
Rifling twist 1 in 16
Primer type Small rifle
Maximum pressure 37,000 to 39,000 PSI
Ballistic performance
Bullet weight/type Velocity Energy
180 gr (Bad rounding hereScript error g) 1,870 ft/s (Bad rounding hereScript error m/s)1,400 ft·lbf (Bad rounding hereScript error J)
Test barrel length: 20
Source(s): Whelen, Townsend. The American Rifle. Century Co. 1918 p. 266

The .351 Winchester Self-Loading (also called .351SL or .351WSL) is an American rifle cartridge.

Winchester introduced the .351SL in the Winchester Model 1907 self-loading rifle as a replacement for the Winchester Model 1905 and the .35SL. The .351SL proved popular with police and security forces as the only chambering available in the model 1907, and was used by France in both World Wars.[1] An experimental Thompson submachine gun was also made to fire .351SL in 1919, but was never produced commercially.[2]

The .351SL is considered inadequate by modern firearm experts as a deer round, but is generally suitable for mountain lion, coyote, or similar medium-sized game, while being over-powerful and insufficiently accurate for varmints. It has had some popularity in the jungle, where its lack of long-range power or accuracy are less important.[1] When first introduced however, many found the .351SL to be a good deer cartridge at ranges under 200 yards, at least in comparison to the many low-pressure cartridges of the black powder era.[3]

See alsoEdit


  1. 1.0 1.1 Barnes & Amber, Cartridges of the World, p.86.
  2. Sharpe, Journal of Criminal Law and Criminology Vol. 23, No. 6. (March–April 1933), p. 1106.
  3. Whelen, Townsend (1918). The American Rifle. Century Co., p. 266.

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