Originally Posted By: MoboyThe burris rings are medium and the DNZ is high. At the moment I now have my Swarovski shimmed to the proper MOA however I would like to know why both mounts and scopes have very low MOA.
Most scopes and mounts aren't designed for shooting much past 500 yards.
Zero MOA bases and rings are designed to put your scope in the center of its elevation range when you get it zeroed on your rifle.
Bases designed for LR rifles have more elevation built in (20 MOA seems to be the most common), and LR scopes have more elevation travel. Many (or most) are 30mm or 34mm tubes to allow even more elevation travel.
Some are even designed to zero in the lower portion of the adjustment range to make more of the elevation travel available.