The designation typically refers to cartridges used in firearms manufactured by a particular company, known for its revolvers and other weapons. For instance, the .38 S&W (not to be confused with the .38 Special) is a rimmed, centerfire cartridge historically chambered in a variety of handguns. Understanding this terminology helps differentiate specific ammunition types.
This nomenclature is essential for proper ammunition selection and safe firearm operation. Using incorrect cartridges can lead to malfunction, damage, or injury. Historically, these shorter cartridges filled a niche for compact, easily concealed firearms, contributing to their popularity in law enforcement and civilian markets. This historical context informs current practices and collecting.