30mm ammunition refers to a type of artillery round that has a diameter of 30 millimeters. It is commonly used in various military applications, including aircraft, armored vehicles, and naval vessels. This caliber is known for its effectiveness against both soft and hard targets, making it versatile in combat situations. The most well-known variant of 30mm ammunition is the 30mm GAU-8 Avenger, which is used in the A-10 Thunderbolt II aircraft. This ammunition can be fired at high rates, providing significant firepower. Additionally, it is often used in autocannons, which are rapid-firing guns designed for anti-aircraft and ground support roles.