I was chatting to my boss earlier this week about an RPG strike where we operate and tried to explain how shaped charges work. It turns out that he, being an ex (civilian) engineer was very knowledgable on the subject - he had been trained to use shaped charges to bore through rock. I had always thought that the jet of molten soft metal penetrated things (armour) but he told me that it was the extreme pressure from the shockwave that caused heat that melts armour or rock. Sounds logical - does anyone know if this is actually the case, or a combination of the two? Neither of us really knew what role the metal in the cone played - I remembered most munitions using copper in the cone and he, with an industrial background, recalled compressed powdered metals of various types and mixtures, depending on the rock to be penetrated, being used. Can any of Arrse experts on the subject enlighten us on the interaction of pressure and molten/vapourised metal (I have googled munroe ffect with little success).