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25×137mm M793 Target Practice with Tracer (TP-T) rounds for the MK-38 being inspected.

The 25 mm caliber is a specific size of cannon or autocannon ammunition. Such ammunition includes the NATO standard 25×137 mm and 25×184 mm rounds, as well as the World War II-era French designed 25×163 mm and 25×193.5 mm R rounds.


The 25 mm round can be used in both an anti-materiel and anti-personnel fashion. When operating in the anti-personnel role, a 25 mm weapon armed with HE rounds can effectively kill large numbers of opposing troops either in the open or in light fortifications. When operating in the anti-material role, a 25 mm weapon armed with AP rounds can disable many aircraft and vehicles, including some main battle tanks.

The US military uses 25 mm weapons in their AV-8B Harrier, AC-130 gunship, M2 Bradley, LAV-25, F-35 Lightning II and as a standard ship-based munition in the Mk 38 autocannon.

Types of 25 mm ammunition

Japanese 25×163mm ammunition from a post-war US technical manual.

A diagram of the M791 25x137 mm round.

Several sub-types of the NATO 25 mm ammunition are available—the most common being armor piercing, high explosive, sabot, tracer, and practice rounds. Cartridges are usually composed of a combination of the aforementioned categories. For example, the M791 pictured to the right is an armor-piercing discarding sabot with tracer (APDS-T) round. It is used against lightly armored vehicles, self-propelled artillery, and aerial targets such as helicopters and slow-moving fixed-wing aircraft.

25 mm weapons

Each weapon is listed with its cartridge type appended.

Current weapons

Historical weapons

See also

Further reading

  • U.S. Army Field Manual 3-22.1

External links

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