Dg -I have to ask what you zero your rifle at to only be 4" low at over 500 yards.With a muzzle velocity of 3500fps my 140 gr ballistic tips drop 17" from 300 yards to 500 yards.I am sighting my rifles in 2-3/4" high at 100 yards and they are 3-1/2" high at 200yards just under 1" high at 300yards about 6" low at 400 yards and 18" low at 500 yards.As far as the 7mm stw cartridge goes I have two of them and use them for all my deer,pronghorn and sheep hunting and could not be happier.