Im trying to boresight my 50 to minimize ammo at the range to set up the zero. Im using a laser boresighter from sitelite that has a nice program where you can give the program details about the rifle and then what distance you have available and it prints a custom target to use for boresighting http://sitelite-lasers.com/BTS.html The problem is if I zero for 200 yards im nearly bottoming out the scope. I only have 4 more MOA adjustment up when I zero with this. (the scope has 65 MOA in elevation adjustment). I have a feeling Im doing something wrong. Do I need a shim for the base of the rings?