The .38/200 was a British military revolver cartridge identical to Smith & Wesson's .38 S&W cartridge but with specific loadings for military service. The .38 S&W was modified for use by the British military and called the .38/200 (also known as 380/200 Revolver Mk I) in 1922 for .38 caliber pistols and revolvers (such as the Enfield No. 2 Mk I and Webley Mk IV) which replaced the larger .455 and .476 inch handguns. The .38/200 cartridge was initially issued to British military forces as the .380/200 Revolver Mk I round. British authorities later issued a different .38 S&W military cartridge with a lighter, 178–-grain ( g) jacketed bullet, known as the .380 Revolver Mk IIz.