25 mm caliber

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

25 mm is a specific (.98 inch) diameter of cannon or autocannon ammunition. It has also been recently used for the Barrett XM109 anti-materiel rifle. Such ammunition includes the NATO-standard 25×137mm and 25×184mm rounds, Soviet 25x218mmSR, as well as the World War II-era French-designed 25×163mm and 25×193.5mmR rounds.

Usage[]

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-materiel role, a 25 mm weapon armed with armor-piercing 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 25×137mm 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[]

• M242 Bushmaster: 25×137mm
• GAU-12/22 Equalizer: 25×137mm
• GIAT M811: 25×137mm
• Oerlikon KBA: 25×137mm
• : 25×184mm
• : 25×184mm
• Type 61: 25×218mmSR
• Type 95 SPAAA: 25×183mmB
• ZPT90: 25×183mmB

Historical weapons[]

• 25 mm Hotchkiss anti-aircraft gun/Type 96 25 mm AT/AA Gun: 25×163mm
• 25 mm Hotchkiss anti-tank gun: 25×193.5mmR
• 25 mm M1940 anti-aircraft gun: 25×218mmSR
• 25 mm Bofors M/32 anti-aircraft gun: 25x205mmR (initial) or 25x187mmR (later)

See also[]

• Caliber
• .50 BMG
• 14.5×114mm
• 20 mm caliber
• 23 mm caliber
  • 23×115mm
  • 23×152mm
• 25 mm caliber
  • 25×40mm
  • 25×59mm
• 30 mm caliber
• List of cartridges (weaponry), pistol and rifle

Further reading[]

• U.S. Army Field Manual 3-22.1

External links[]

• Federation of American Scientists: 25mm Ammunition
• UXO Safety Information^{[permanent dead link]}