Re: Optical Center, canted bases, mounting questions....
i know you want to tighten those rings and forget them but you also have to test the scope to see if it's tracking verticle or not. put a target up at 100, make sure you have at least 30-36" of usable material above it. shoot 2-3 shots into target, hopefully you'll have a nice small group in the center left and right. take a level and mark a perfect verticle line from the center of your group up at least 30". now go back and crank your scope up 20 MOA or so and shoot another group. this group should print 20 or so inches above the first and on the verticle line. if it doesn't, you have to rotate your scope till it does. now you can tighten those rings down and practice, practice, practice!