I have a leupold VX III 6.5-20X40 with target turrets and was shooting the other day and to find out how much elevation and windage I have to work with I ran the ajustments to the top and bottom of their range when I reset the knobs to zero and resumed shooting the scope was no longer zeroed /ubbthreads/images/graemlins/mad.gif. Is this a malfunction or have other people had the same problem. The change wasn't huge maybe 3/4 in at most but enough to annoy me. And I don't consider this acceptable for hunting purposes. What should be done about this?