HI Gollum , the Hawke scopes you speak of are ( IMO ) very good , clear , and well made. I personally like hawke , especially as they have good light gathering capabilities . You can expect to use it well for rangefinding , as long as you know what your doing . As far as a wheel , look on e bay , jsramsbottom , bbs , the usual suspects . Do you shoot 177 or 22 ? have a play with chairgun ,and once you know your trajectory you can get the scope set up . To be honest its all a bit beyond me ive , mapped my scope so i know where i am , and its same from 13 -35 yds ( 177 ) bit of hold over or und