allow a 40MOA correction to made in any direction with the appropriate inserts. The Burris Signature XTR Rings come with all inserts, a little beefier and without a doubt, the best rings I have ever purchased. If the scope has 1/8 min clicks, it will run out of elevation faster then a 1/4 model. Had the same problem with with a Tasco world class plus 8x32x50 on a .22lr when sighting in at 100yds.
Edit. LT beat me to it. He must use more then two fingers when typing. LOL
Ammunition is like firewood. The more you have, the warmer you feel.