c/o wiki..... 'Military railguns capable of delivering tungsten armor piercing bullets with kinetic energies of nine megajoules have been developed. Nine MJ is enough energy to deliver 2 kg of projectile at 3 km/s - at that velocity a rod of tungsten or of another dense metal could easily penetrate a tank, and potentially pass through it.'
They.ve been tinering with it since I was a kid.
Been on with it the Dundrennan (Ithink) ranges on the Scots side of the Solway. As far as I know it works very well but the power demands are extremely high
They are working on both, ETC and EM. As far as a rail gun goes, they are working with a view to producing a main armament for an AFV which would be EM. Calibres suggested have varied from 45mm to 120mm. Your guess is as good as mine, of DGA's or any one else's. The difference being DGA is footing l'addition!