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20 × 110 mm
Регіон
Egypt
Argentina
Brazil
Norway
Italy
Spain
France
Switzerland
Категорія
Боєприпаси, ракети та високоточне озброєння
The ammunition is almost identical to the 20 × 110RB Oerlikon, but the case is a rimless type rather than a rebated rimless. European manufactured ammunition uses Berdan primers, while the US M21 , M21A1 and M21A1B1 cases use a Boxer primer. In post-war years the US Air Force developed electrically primed ammunition in this chambering for use in the M24 gun. It was prominently marked 'ELECTRIC' on the side of the cartridge case, and the primer cap exhibits a ring of black insulating material around it. Other
nations have adopted electric priming, although the presence of the insulating material is often the only indication. Projectiles resemble those developed for the Oerlikon 20 × 110RB gun. They are notable for having the explosive cavity reduced in diameter at the rear, in order to better resist the crushing action set up by the driving band during its passage up the gun bore. For this reason the tracer recess is smaller. This cartridge was used extensively by the UK and USA during the Second World War and large numbers of these guns are still in use. Both countries produced the same range of cartridges in this chambering as that produced for the Oerlikon guns. The projectiles were exactly the same, only the cartridge case and propelling charge differed. Applications include hispano-Suiza HS404, HS804, Mk II and Mk V guns; US M3, M24 and M24A1 guns; UK Mks 2 and 5; Israel TCM-20 ; Yugoslav M55 guns.