Bullets are, definitely, the most common form of ammunition. Small arms calibers vary from .17 as much as .50. Airguns and BB guns utilize a .177 caliber bullet. 38 Special Ammo is probably the most popular used in the United States. Despite its name, it is a .357 caliber bullet https://caidenexod82716.illawiki.com/2812739/buying_ammunition_online