I've always wondered whether it would be best to use something like a .577 2-3/4" or 45-70, or something faster like a double 375 (or 450/400). I have often read that for thin skinned DG a velocity of higher than 2150 fps (or was it 2250?) is preferable due to the hydrostatic shock effect, which is why the 416 Rigby is so rated as a lion calibre. Any thoughts on this? Clearly none of these calibres would have a problem with penetration on big cats... But is hydrostatic shock something to be considered or is it a myth?