I have a Savage 110 with scope in 30-06 that I sighted in today. Due to range and time limitations I was only able to sight it in at 25 yards with Remington 180gr corelocked ammo. It is right on the cross hairs at this distance - how much should I expect it to change with the same ammunition at 100 - 150 yards? My stepson wants to use it to hunt deer this week.