We are not talking about deadly knockdown power here, though it may run a parallel path? I am loading .40 S&W cartridges. If I load a 145 and 175 cast boolit and both have the same FPS velocity through a chronograph will they have equal knockdown power on steel plates? This last season I was shooting 145s and am thinking about going to a heavier boolit if that will work more efficiently on off center hits. Is there a math formula to figure this out?