.401 Winchester Self-Loading

.401 Winchester Self-Loading (Center) with .308 Win (left) and .45-70 (right).

Type

Rifle

Place of origin

USA

Production history

Designer

Winchester Repeating Arms Company

Specifications

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

37000 to 39000 PSI

Ballistic performance

Bullet weight/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
Source(s): Whelen, Townsend. The American Rifle. Century Co. 1918 p. 266

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

Winchester introduced the .401SL 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.^[1]

The .401SL proved powerful enough for both deer and other large game at ranges under 150 yards.^[2] Both 200gr and 250gr bullet weights were offered by Winchester and other ammunition manufacturers 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. This feature helped promote the use of the .401SL on dangerous game such as moose and grizzly bear in spite of the lack of controlled expansion bullet designs, which doubtlessly would have improved game-taking performance and the subsequent reputation of the .401SL cartridge.^[3]

The .401 SL is of similar size to the later .41 Remington Magnum; but the longer self-loading rifle cartridge produced a muzzle energy of 2,000 foot-pounds force (2,700 J) with a 200-grain (13 g) bullet,^[4] while the magnum revolver is credited with a muzzle energy of 790 foot-pounds force (1,070 J) with a 210-grain (14 g) bullet.^[5] The .41 Rem magnum revolver comparison is not entirely relevant, however, since in a carbine the same cartridge generally at least doubles its energy over the much shorter barreled version.

References

↑ Houze, Herbert G. (2003). Winchester's First Self-Loading Rifles. 'American Rifleman' Vol 151(5) p.84.
↑ Whelen, Townsend. The American Rifle. Century Co., 1918. p.274
↑ Stebbins, Henry M. Rifles, A Modern Encyclopedia. Stackpole Co., 1958. p.274
↑ Sharpe, Philip B. (1953). Complete Guide to Handloading (3rd ed.). New York: Funk & Wagnalls. pp. 425&436–437.
↑ Ramage, Ken (2000). Gun Digest 2001 (55th ed.). Iola, Wisconsin: Krause Publications. p. 208. ISBN 0-87341-924-3.

Winchester firearms and cartridges

Rifles

Lever-action	Henry rifle Model 1866 Model 1873 Model 1876 Model 1886 Model 1892 Model 1894 Model 1895 Model 53 Model 55 Model 64 Model 65 Model 71 Model 88 Model 150 Model 250 Model 255 Model 9422

Bolt-action	Model 1878 Hotchkiss Model 1895 Lee Navy Model 1900 Model 1902 Model 1904 Model 43 Model 47 Model 51 Imperial Model 52 Model 54 Model 56 Model 57 Model 58 Model 59 Model 60 Model 60A Model 67 Model 68 Model 69 Model 70 Model 72 Model 75 Model 121 Model 131 Model 141 Model 320 Model 325 Model 670 Model 770

Pump-action	Model 1890 Model 1906 Model 61 Model 62 Model 62A Model 270

Semi-automatic	Model 1903 Model 1905 Model 1907 Model 1910 Model 30 Model 63 Model 74 Model 77 Model 100 Model 190 Model 490

Full-automatic	Olin/Winchester FAL Model 1917

Falling-block action	Model 1885

Shotguns

Pump-action	Model 1893 Model 1897 Model 1912 Model 25 Model 42 Model 1200 Model 1300

Lever-action	Model 1887 Model 1901 Model 9410

Single-shot	Model 20 Model 36 Model 37 Model 37A Model 41

Double-barrel	Model 21 Model 24 Model 96 Model 101

Semi-automatic	Model 1911 SL Model 40 Model 50 Model 59 Model 1400 Model 1500 SX-1

Cartridges

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.401 Winchester Self-Loading

See also

References