The article titled casing is a disambiguation page.

A casing, also called case or the brass, is the part of a cartridge that contains the gunpowder charge, the primer, and the bullet. After a shot is fired, the casing is empty because its gunpowder charge has burned, the primer has been used and the bullet has been propelled. The empty case is often ejected automatically. After a crime committed with a firearm, police attempt to collect cases and bullets used in weapons associated with the crime.

Ammunition

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