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25 × 137 mm
Регіон
United States
Norway
Belgium
France
Germany
Netherlands
Switzerland
Категорія
Ammunition, Missiles and precision weapons
The case is rimless, bottlenecked and of lacquered steel. It is instantly identifiable by the belt link locating groove just behind the case shoulder. This is expanded by internal pressure when fired, but it leaves an easily discerned mark around the case. The original projectiles were of typical Oerlikon pattern but many new types have been developed subsequently by Oerlikon Contraves Pyrotec AG, as well as in the USA and other countries. In the early 1960s the US Army's Bushmaster MICV cannon project resulted
in, among other things, the Thompson-Ramo-Wooldridge TRW-6425 cannon, designed by the late Eugene Stoner of Armalite rifle fame. When Bushmaster was shelved, the European rights to the design were acquired by Oerlikon-Bührle (now Oerlikon Contraves AG ). The company made some improvements and produced it as the Model KBA, developing a range of ammunition to go with it. Since then the utility of this calibre has been generally recognised and the Bushmaster project was eventually revived, the Hughes Chain Gun and the GAU-12 Gatling gun were developed and the British Aden aircraft gun adapted to this calibre. Other designers have also developed weapons for this round. Applications include oerlikon KBA; GAU-12/U and M242 ; Mauser Model E; Rheinmetall Rh205; Giat M811; Aden 25.