What type of bullet does rimfire ammunition fire?

Rimfire ammunition is characterized by its unique primer design, which is located along the rim of the cartridge case rather than in the center. This design allows for a simpler and often less expensive manufacturing process, making rimfire cartridges particularly popular for small caliber firearms, such as .22 caliber rifles and pistols. The firing mechanism for rimfire rounds relies on the impact of the firing pin striking the rim of the cartridge, igniting the primer and thereby firing the bullet.

In contrast, other types of ammunition, such as full metal jacket, blended, and centerfire, have different construction and functioning methods. Full metal jacket refers to a specific type of bullet design, while centerfire cartridges have their primer located in the center of the cartridge base, which is a more robust system typically used in higher caliber firearms. Thus, recognizing that rimfire ammunition specifically refers to the type of primer and construction makes it clear why this is the correct choice.