It can vary by rifle also. I used a 168 Sierra Match King and my friend used a Sierra 165 HPBT. Both used the same powder load. Both rifles were Devine made M1A's only 4 numbers apart. Both would do 1 inch with a scope at 100 yards. If we traded ammo both rifles opened up to around 3 inches at 100 yards. Lots of variables out there when working up loads.