The only real exception I have seen to this 80 grain "rule" is the .30-378 Weatherby. I don't want to personally own one of these cannons; but I have built a number of them and the darn things will really shoot at long range. I think a pie plate at 750 yards would be a high percentage shot with a good one. For my money, I'll just sneak a couple hundred yards closer. Or maybe even drive a little ways closer . . .