# Internal vs External Ballistics: How Ammunition Performance Changes in Two Phases Ballistics is typically divided into internal and external phases, and ammunition behavior changes significantly between them. Understanding both is essential when evaluating cartridges such as 9mm ammo, .223 ammo, .308 ammo, and .22 LR ammo. Internal ballistics refers to what happens inside the ... https://bulkammotogo.com/product-category/223-remington-ammo/