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Rimfire is a type of metallic firearm cartridge characterized by its priming compound located in a hollow rim at the base of the cartridge case. When the firing pin strikes the rim, it crushes the rim, igniting the priming compound. This ignition then sets off the main propellant charge within the case. The rimfire design is one of the oldest self-contained cartridge designs, dating back to the mid-19th century.
The most common rimfire cartridge is the .22 Long Rifle (.22 LR). This cartridge is widely used
Rimfire ammunition is typically manufactured with lead bullets, though some loads feature jacketed bullets. The cases