Thanks for that. It seems fair enough. But I wonder about the next level of big game: elephant? Would the extra 40 grains be beneficial? I suppose the .416 Rigby has knocked over many elephant using standard 400 grain solids. I don't have any data for the 450 grain bullets, sorry, only for the 410 grain bullets. But Woodleigh will send you their recommendations if you tell them what powder you wish to try.