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4.73 x 33 mm
Регіон
Germany
Категорія
Боєприпаси, ракети та високоточне озброєння
The conventional bullet is set into a block of propellant and held rigidly. The block is square in section and longer than the bullet, but the overall length is about half that of an equivalent conventionally cased cartridge. The primer is a small pellet of initiating mixture loaded into a cavity in the base of the propellant block. Ahead of the primer is a small booster charge of initiatory explosive. This, when ignited by the cap, blows the bullet out of the block and seats it in the rifling before ignition of
the propellant takes place. Whilst this seating movement is taking place the block of propellant is shattered and ignited. The object in seating the bullet, by means of this booster charge, is to ensure that the bullet is firmly lodged in the rifling before the propellant explosion takes place, so avoiding any leak of gas around an unseated bullet. It also ensures that the chamber pressure and gas volume are constant from round to round. The bullet is streamlined, of conventional form and consists of a lead core, steel jacket and gilding metal envelope. It shows no fragmentation on impact and will pierce 6 mm of mild steel plate at 300 m range and a standard steel helmet at 600 m range. Of this cartridge was carried out by Dynamit Nobel and Heckler and Koch from about 1970 onwards, specifically for the G11 rifle. Original versions used nitrocellulose propellant, but this gave rise to cook-off problems because of the absence of a brass case to shield the heat from the chamber walls. The propellant was then changed to a new High Temperature Propellant (HiTP), based on a denatured hexogen explosive compound. The new propellant raised the cook-off temperature by 100ºC, rendering the weapon immune to cook-off problems in normal use. Of the G11 has ceased and ammunition is no longer in production. The cartridge is maintained herein only for technical reference purposes. Applications include heckler and Koch G11 rifle.