It was intended to fire super-long - range rocket projectiles weighing 680 kilograms to a range of 190 kilometres ( 118 mi ) .
The Langer Gustav was a long cannon with 52 centimetre ( 20.5 in ) calibre and a 43 - metre barrel .
Langer Gustav was intended to fire super-long - range rocket projectiles weighing 680 kilograms to a range of 190 kilometres ( 118 mi ) .
The Langer Gustav was a long cannon with 52 centimetre ( 20.5 in ) calibre and a 43 - metre barrel .