 is a centerfire, rimless, bottlenecked rifle cartridge that was developed in 1970 by Günter Frères of the Deutsche Waffen und Munitionsfabriken (DWM).In 1968 Günter Frères of the Deutsche Waffen und Munitionsfabriken (DWM) had developed the parent case the rimmed 5.6×50mmR Magnum (designated as the 5,6 x 50 R Mag.by the C.I.P.