.38 caliber
.38 caliber is a frequently used name for the caliber of firearms and firearm cartridges.
The .38 caliber is a large firearm cartridge (anything larger than .32 caliber is considered a large caliber).: 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.: 68