A brass cartridge is the largest part of ammunition. It holds the powder and the bullet, along with a primer in its end that is called the "rim." The rim is part of the "head," which leads to the "body" and then to the "shoulder" and the "neck" into which the bullet fits. When the primer is struck by the weapon's firing pin, it ignites the powder which creates a large amount of pressure in the cartridge. The pressure pushes the bullet out of the weapon's barrel and towards the target. Manufacturers produce cartridges to prevent them from bursting and causing flash-back that would otherwise hit the shooter. In automatic weapons, they must also be constructed to automatically eject and make room for the next cartridge.
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