i have a 6-20 Lupy on my long range gun and it's great. however, if i was getting a scope to shoot from 0-600, i would want something with a little less magnification on the lower end. Bushnell has that new 6500 series that would be the cats ear lobe for what you're doing. i think they make a 2.5-14.5 scope. i don't remember having any problems putting the crosshair on a groundhog at over 1k with the scope set on 16x, i wouldn't think shooting big game at 600 would be any problem with a 14 power.