30 mm caliber

It includes the NATO standardized Swiss 30×173mm (STANAG 4624), 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.

The U.S. military uses 30 mm weapons in their A-10 Thunderbolt II ground-attack aircraft, AC-130 gunship (AC-130J Ghostrider variant), and AH-64 Apache attack helicopter.

The United States Navy uses 30 mm weapons on the San Antonio-class amphibious transport dock and on Freedom and Independence-class littoral combat ships as part of the surface warfare (SuW) package.

[3][4] In 2022, the United States Coast Guard announced plans to install 30 mm Mk44 chain guns on newly-built Polar Security Cutters (PSCs), though existing cutters would retain their 25mm Mark 38 mounts.

As a result, ammunition in 30 mm comes in several varieties: armor-piercing (AP), high-explosive (HE), airburst, and target practice (TP) rounds.