A cartridge, in the context of firearms, is a complete unit of ammunition that consists of several components assembled together. A typical cartridge includes: 1. **Bullet**: The projectile that is fired from the firearm. It is usually made of lead or a lead alloy, sometimes with a metal jacket. 2. **Propellant**: Usually gunpowder, this substance ignites and creates gas when burned, propelling the bullet out of the cartridge and down the barrel of the firearm.
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