Firearm propellant
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Firearm propellants are a specialized type of propellant used to rapidly generate gas causing a pressure difference accelerating a projectile (typically a bullet, slug, or pellets) through the barrel of a firearm. Short-barrel firearms such as handguns necessitate faster-burning propellants to obtain sufficient muzzle energy, while long guns typically use slower-burning propellants. The pressure relationships between propellant chemical reactions and bullet response are described as internal ballistics.