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.38 caliber is a frequently used name for the caliber of firearms and firearm cartridges.
The .38 is a large firearm cartridge (anything larger than .32 is considered a large caliber).[1]: 42 Before 1990, the standard sidearms of police in the United States were revolvers that fired the .38 Special cartridge, seconded by revolvers firing the .357 Magnum, a lengthened version of the .38 Special.[1]: 68