Bullets are ammunition used by firearms to attack or defend in battle, which causes direct damage to the target. They are also the most widely used and consumed ammunition in all kinds of weapons. Modern military bullets are mainly used to kill living targets, and can also be used to destroy light armored vehicles, low-altitude aircraft, military facilities and other targets. In order to make all kinds of firearms equipped by the army shoot at different targets, a large number of bullets with different purposes are needed, so the production and supply of bullets are very important in the war. The development of science and technology has promoted the progress of bullets. Because all kinds of firearms are still one of the irreplaceable equipment of other weapons in modern warfare, the role of bullets can not be ignored.