Ammunition size chart
Increases the size of the bore with respect to the diameter of the shot somewhere between 10. Inch caliber metric caliber typical bullet diameter common. Bullets Sizes Calibers And Types Definitive Guide Pew Pew The .223 Remington was the original ammo used by the AR-15/M-16. However, due to NATO requirements, it was transformed into the current 5.56x45mm NATO ammo. The change was necessary to meet the NATO requirements: it has View Diagram Ammunition size chart