Bullets are, by far, the most common type of ammunition. Small arms calibers range from .17 approximately .50. Airguns and BB guns utilize a .177 caliber bullet. 38 Special Ammo is among the most popular being used in the United States. Despite its name, it's actually a .357 caliber bullet https://reidneov58248.wikinstructions.com/9165838/buying_ammunition_online