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A '''bullet''' generally describes the projectile which is fired from a [[rifle]], [[pistol]], and other types of [[gun]]s. Bullets are most commonly made of [[lead]] or [[copper]], although armor-piercing bullets may be made of [[steel]] or other alloys.
Bullets vary widely in size. Many pistols fire bullets that are only eight [[millimeter]]s in [[diameter]]. In contrast, a 50-caliber rifle fires bullets that may be larger than an inch in diameter, and some guns, such as mounted anti-aircraft [[machine gun]]s, may fire bullets that are several inches in diameter.
In a broad sense, a bullet differs from a [[missile]] primarily in the fact that a bullet does not have any method of guiding or propelling itself. Both the direction a bullet travels and the velocity it reaches are determined solely in and by the barrel of the firing mechanism. In contrast, a missile, broadly defined, generally carries a supply of propellant and may include a guidance system.
[[Category:Guns]]