|Place of origin||United States|
|Designer||Ballard Rifle & Cartridge Company|
|Case type||Rimmed straight|
|Bullet diameter||.3775 in (9.59 mm)|
|Neck diameter||.392 in (10.0 mm)|
|Base diameter||.421 in (10.7 mm)|
|Rim diameter||.506 in (12.9 mm)|
|Case length||2.085 in (53.0 mm)|
|Overall length||2.510 in (63.8 mm)|
|Rifling twist||1 turn in 18″|
|Maximum CUP||30,000 CUP|
|Source(s): Whelen, Townsend. The American Rifle. The Century Co.: 1918, p. 272.|
Winchester continued to use the round in various rifles until about 1940, and also used it in a few commemorative editions of rifles since then.
A modernized version of the cartridge debuted in 1978 as the .375 Winchester, designed with higher pressures and to be used in modern firearms only.
It is not safe to fire factory .375 Win ammunition in rifles chambered in .38-55, especially in older examples. The brass is very similar (shorter by approx. 1 mm), but using modern, higher pressure .375 loads in an older rifle could cause serious injury to the shooter.
- Barnes, Frank C. (5 October 2012). Cartridges of the World: A Complete Illustrated Reference for More Than 1,500 Cartridges. Iola, Wisconsin: Gun Digest Books. p. 91. ISBN 978-1-4402-3059-2. Retrieved 20 June 2013.
- Sapp, Rick (2007). Standard Catalog of Colt Firearms. Gun Digest Books. p. 288. ISBN 978-0-89689-534-8.
- Thomas Henshaw (1993). The History of Winchester Firearms 1866-1992. Academic Learning Company LLC. p. 232. ISBN 978-0-8329-0503-2.