The .38 S&W, also commonly known as .38 S&W Short, 9×20mmR, .38 Colt NP , or .38/200, is a revolver cartridge developed by Smith & Wesson in 1877. Versions of the cartridge were the standard revolver cartridges of the British military from 1922 to 1963. Though similar in name, it is not interchangeable with the later .38 Special due to a different case shape and slightly larger bullet diameter.
A box of modern .38 S&W rounds
Revolvers chambered for .38 S&W (Colt New Police). Colt Police Positives L&R- Iver Johnson Hammerless Safety Front.
British Enfield No.2 Mk I* DA-only service revolver in .38/200
A box of WWII-dated .380" Revolver Mk IIz cartridges (and separate cartridges)
The .38 Special, also commonly known as .38 S&W Special, .38 Smith & Wesson Special, .38 Spl, .38 Spc, or 9x29mmR is a rimmed, centerfire cartridge designed by Smith & Wesson.
.38 Special cartridge
First model M&P revolver designed in 1899 for the .38 Special cartridge. This particular revolver left the factory in 1900.
Smith & Wesson M&P in .38 Special produced in 1899
A .38 Special Jacketed Soft Point round