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The .38 Special, also commonly known as .38 S&W Special (not to be confused with .38 S&W), .38 Smith & Wesson Special, .38 Spl, .38 Spc (pronounced "thirty-eight special"), or 9x29mmR is a rimmed, centerfire cartridge designed by Smith & Wesson. The .38 Special was the standard service cartridge for the majority of United States police departments from the 1920s to the 1990s. It was also a common sidearm cartridge used by United States military personnel in World War I, World War II, the Korean War, and the Vietnam War. In other parts of the world, it is known by its metric designation of 9×29.5mmR or 9.1×29mmR. Known for its accuracy and manageable recoil, the .38 Special remains one of the most popular revolver cartridges in the world more than a century after its introduction. It is used for recreational target shooting, formal target competition, personal defense, and small-game hunting. The .38 Special was designed and entered production in 1898 as an improvement over the .38 Long Colt which, as a military service cartridge, was found to have inadequate stopping power against the charges of Filipino Muslim warriors during the Philippine–American War. Upon its introduction, the .38 Special was originally loaded with black powder, but the cartridge's popularity caused manufacturers to offer smokeless powder loadings within a year of its introduction. Despite its name, the caliber of the .38 Special cartridge is actually .357 inches (36 caliber/9.07 mm), with the ".38" referring to the approximate diameter of the loaded brass case. This came about because the original 38-caliber cartridge, the .38 Short Colt, was designed for use in converted .36-caliber cap-and-ball Navy revolvers, which had untapered cylindrical firing chambers of approximately diameter that required heeled bullets, the exposed portion of which was the same diameter as the cartridge case. Except for case length, the .38 Special is identical to the .38 Short Colt, .38 Long Colt, and .357 Magnum. This nearly identical nature of the three rounds allows a .

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