If we make all the usual assumptions.....the mounts are OK and pointing in the right direction, everything is bolted down tight, the dovetail is OK...gun barrel is OK and pointing out front, etc, etc...then you start to run out of options and have to consider the scope.
Wind the turrets all the way from end to end counting the clicks (not too hard at the end stops) and then leave in the middle!
If this doesn't help then perhaps the scope is fubared!!
I aint been near it yet Deker ! but I had the same problem of winding the turrets the wrong way