30 mm caliber
The 30 mm caliber is a range of autocannon ammunition. It includes the NATO standardized Swiss 30×173mm, the Soviet 30×155mmB, 30×165mm and 30×210mmB, the Czechoslovak 30×210mm, the Yugoslav 30×192mm, the British 30×113mmB, and the French 30×150mmB and 30×170mm cartridges.
Usage
Ammunition in 30 mm is typically not used against personnel but rather as an anti-materiel or armor-piercing round. Rounds of this size can be effective against lightly armored vehicles as well as fortified bunkers. It is also a popular caliber for shipboard close-in weapons systems, such as the Russian AK-630 and Dutch Goalkeeper CIWS.The Armed Forces of the Russian Federation use their 30 mm weapons in a variety of vehicles, including the Su-25 attack aircraft, Mi-24 helicopter, Mi-28 attack helicopter, Ka-50 attack helicopter, and the BMP-2, BMP-3, and BTR-90 infantry fighting vehicles. The most modern anti-aircraft gun systems in use by Russia are chambered in 30 mm.
The U.S. military uses 30 mm weapons in their A-10 Thunderbolt II ground-attack aircraft, AC-130 gunship, and AH-64 Apache attack helicopter. It was going to be used in the Expeditionary Fighting Vehicle, until the project was canceled. The United States Navy uses 30 mm weapons on the San Antonio-class amphibious transport dock and on and s as part of the surface warfare package. In 2012, the Navy decided to replace the Mk 110 57 mm cannons on s with the Mk 46 GWS, a navalized mounting of the Mk44 Bushmaster chain gun.
In 2022, the United States Coast Guard announced plans to install 30 mm Mk44 chain guns on newly-built Polar Security Cutters, though existing cutters would retain their 25mm Mark 38 mounts.
Types of ammunition
30 mm weapons are used in a variety of roles. As a result, ammunition in 30 mm comes in several varieties: armor-piercing, high-explosive, airburst, and target practice rounds. Both AP and HE cartridges commonly possess incendiary or tracer elements, which may be noted in its designation; API and HE-T are Armor-Piercing Incendiary and High-Explosive Tracer respectively.Weapons
Current weapons
Historical weapons
| Weapon | Country of origin | Designer | Cartridge | Type | Example platforms |
| MK 108 |  Nazi Germany |