I could be way off but was reading another forum earlier tonight (Intl Ammo Assoc) and they were discussing an old sight and apparntly it was to compensate for drift. http://cartridgecollectors.org/forum...pic.php?t=5540
Other wise could it be you are unconciously tilting the rifle slightly. I hold mine twisted about 5 degs clockwise
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Pro-1080 Poison and proud of it!!