A cartridge, is a single unit of ammunition

* A cartridge, is a single unit of ammunition. For a modern small arms cartridge this is the combination of bullet, propellant, primer and cartridge case in a single unit.
* A "round" is a term synonymous with a fully loaded cartridge containing a projectile, propellant, primer and casing.
* Large caliber cannon often fire explosive-filled projectiles known as shells, non-explosive projectiles may be used for practice (see artillery).
* Large numbers of small projectiles intended to be fired all at once in a single discharge are also called shot; hand-held guns designed for this type of ammunition are generally known as shotguns.
* Duds are fully loaded ordnance that fail to function as intended. A cartridge that fails to fire in the weapon is known as a misfire. A partially functioning round is named a hang fire. Dud ammunition, unexploded ordnance (UXO), is regarded as highly dangerous, and most safety officials inform civilians to report finding of any large-bore duds to the local police or military.
* Dum-dum rounds were early attempts to cause contact-initiated expansion. Many were leadnose bullets with "X" marks cut across the nose.


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