or the other way....you dont want to part dirty 06 from scope..........SO take scope off dirty06......put your trouble child on it...DONT MOVE ANYTHING....put up large target and shoot say 3 rounds...move adjustment....shoot another 3...move back...shoot another 3....
IF first and last groups overlap...its not scope its something youve done to rifle...put dirty06 scope back on and recomfirm zero..... then unpack your problem child again,take note of recoil lug etc as others have mentioned...maybe bit of crap under it,jacking it up slightly.
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