What is the term for the projectile fired from a firearm?

The term "bullet" specifically refers to the projectile that is expelled from the barrel of a firearm when it is fired. This is the component of ammunition that is designed to travel through the air and strike a target. It is typically made of metal, such as lead, and can come in various shapes and sizes depending on the intended use, such as for hunting, target shooting, or self-defense.

In contrast, the casing is the container that holds the bullet, powder, and primer together as a single unit of ammunition but does not itself project from the firearm. The powder is the explosive material that ignites to propel the bullet, and the primer is the component that ignites the powder when struck by the firing pin. Both the casing and the powder are essential to the functioning of the ammunition, but they do not describe the projectile itself. Therefore, "bullet" is the accurate term to identify the projectile fired from a firearm.