Bullets are, undoubtedly, the most common form of ammunition. Small arms calibers range from .17 as much as .50. Airguns and BB guns use a .177 caliber bullet. 38 Special Ammo is one of the most popular used in the United States. Despite its name, it's rather a .357 caliber http://www.grupoandere.com.mx/members/beatzoo3/activity/776354/