in my opinion do a 4.5 to 14 powered leupold. Then actaully shoot the gun. You may not need anymore to shoot at 500 yards. I can hold 5 inches at 500 with a 2.5 to 10 weaver of a bipod and a rear sandbag. You should be able to do this with a .264 a 14 power scope and some good loads.
