Can someone please bring me up to speed here... I have a Leupold 4.5X14 LR BC. I've been concerned lately that there may be something wrong with it. It seems like every time I go to the range, I need to make a windage adjustment from left or right (nothing consistent). Once I redial the center it seems to shoot fine during that session, until the next trip out, when I go through the same exercise to center it again. I contacted Leupold's tech line. They suggested that I mechanically center the scope, then check the optical center, "these should be fairly close" according to the tech. What I found was they were not even close. After optically centering the scope I bore sighted using a Leupold bore sighter, have not been to the range since. My question / question's... 1. Should the mech. center & optical center be very close? 2. Is it critical that they are? With a "multiple aim point" (Bone & Crocket) reticle, where once its zero'd no adjustments are necessary, how critical would a vast variance between mech. zero & optical zero be? 3. Which would be the more important one to set the scope to, mech. cntr or optic. cntr.? 4. Finally, would having a drastic difference between the two be a clue of internal issues that would warrant sending it to the manufacture for repair? I know this is a lot to consume but if anyone could school me I would appreciate it.