Forsyth wrote than many sportsmen, who had SxS bore rifles made in England (1840's-1860's), found they had rifling twists that would not support heavy loads needed for the beasts of India and that the balls stripped in the rifling. This rendered them no more accurate "than a common smoothbore", thus they loaded them heavily, got close and "killed by the smashing blow of the ball." - or some such prose.