iv recently aquired a weihrauch hw90 theoben gas ram 22 air rifle, 11.2 ft/bl iv put 3-9 x56 eg excelvan scopes, not expensive at all, but iv learnt how to zero them in, from 40 metres away - with a can propped up on a stick ect, i thought i was zeroed in, but out shooting yesterday morning, proved me wrong, is it the cheapness of the scopes ? or is it me ? But My question is, are the more expensive scopes more accurate than the cheaper versions ? and are the one's i currently have, ok for the job? some may think its a stupid question, but my basic question i