Each rifle or handgun is designed to be used with a specific type of cartridge or ammunition that matches the barrel's caliber or bore size. This means the firearm's barrel is made for one particular caliber or gauge, and the ammunition must correspond exactly to that specification to ensure proper function and safety. Rifles often have rifled barrels for spinning bullets for accuracy, and handguns also have calibrated barrels for specific ammunition types. Rifles come in types such as bolt-action, lever-action, and semi- automatic, each using cartridges designed for that rifle type. Handguns are generally revolvers or semi-automatic pistols, each chambered for specific handgun calibers like 9mm. Using the correct cartridge ensures accuracy, safety, and proper operation of the firearm.