I think I need ideas on shims for a Swarovski Z-3 4x12x50 BT on top of weaver style bases and rings. This is on a Rem 700. I just took off another Z-3 from this rifle, 3x10x42 and I am using the same bases and mounts. Not sure why but I seemed to have bottomed out trying to sight in. I can no longer turn the elevation knob to shoot lower and I'm shooting 1 inch high at 50 yds. This has a ballistic turret and this is with the turrets off. Just won't go anymore. Lower mounts won't work as I only have about less than a 1/4 inch between optic lens and rifle. I see some people recommend shimming when this happens. What do some of you do in these circumstances?