Ammunition
Ammunition - the projectiles with their fuses, propelling charges, or primers fired from guns, explosive military items (such as grenades or bombs) [Merriam-Webster Dictionary].
Ammunition size is usually expressed in caliber, the projectile's diameter measured in millimeters or inches. Generally, projectiles less than 20 mm or .60 inches in diameter are classified as small-arm, and larger calibers are considered artillery. A complete round of ammunition consists of all the components necessary for one firing of the gun. These typically include a projectile, the propellant, and a primer that ignites the propellant. Other components such as cartridge case, fuze, and bursting charge are frequently included.
In artillery ammunition, a fixed round is a complete round in which all components are securely joined by a cartridge case. In semifixed ammunition, the projectile is detachable from the cartridge case, an arrangement that allows for the size of the propelling charge to be adjusted, after which the projectile can be inserted loosely into the case. A complete round consists of three components in separate-loading ammunition: the fuzed projectile, the propellant (in several combustible cloth bags), and the primer. This round type is used in the largest-caliber guns because its separated components are easier to handle.
Complete artillery rounds are further classified according to the type of projectile employed, such as high-explosive, armor-piercing, antipersonnel, nuclear, or chemical [Encyclopedia Britannica].
Ammunition. Merriam-Webster Dictionary. Retrieved from: https://www.merriam-webster.com/dictionary/ammunition
Ammunition. Encyclopedia Britannica. Retrieved from: https://www.britannica.com/technology/ammunition