Rimfire refers to a type of firearm cartridge where the primer is located in the rim of the cartridge case. When struck by the firing pin, the rim crushes and ignites the primer, which then ignites the gunpowder inside. This design is typically found in smaller caliber ammunition, such as the popular .22 LR. Rimfire cartridges are generally less powerful than centerfire cartridges, making them ideal for target shooting, small game hunting, and training. Common rimfire calibers include .22 Short, .22 Long, and .22 Magnum. Their lower recoil and cost-effectiveness make them accessible for beginners and recreational shooters.