Like mr. Big said, you'll have to raise the front if its shooting high. Strip or 2 cut out of a coke can should do it. May want to lap ur rings cause shimming it will throw them out of wack a little. The burris signature zee rings have inserts that would let you do this with out lapping.
You can also get inserts for the signature zee rings that will let u slant the scope for the elevation u need without shimming.