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 .38/200 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, 178–180-grain jacketed bullet, known as the .380 Revolver Mk IIz.
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