Ok, rookie question. New 700 5r in 308. One piece rail scope base, med height rings, Redfield 6-18x44mm scope. The problem I'm having is I can't get to zero at 100yd. It will shoot 3"-4" high and the scope is bottomed out with no more adjustment. I can not seem to get the point of aim to meet the point of impact. The windage works good and moves when adjusted but the elevation is at the max adjustment and its high every shot. It will nail groups with no problem but I have no more down adjustment. Any suggestions at what I have wrong?