just got the mosin pu sniper manual from paladin press. translated from russian with original illustrations. it includes a ton of cool info regarding the proper use of the scope and soviet sniper doctrine. it also covers how the scope is constructed. info on how to use the reticle as a range finder. the top knob is elevation and is a bdc set in meters. 1=100 meters 13=1300 meters. side knob is windage and is in mils +-1-10. the two outside screws on each knob are for zeroing the bdc dial once minor adjustments are made. major adjustment is done via the scope mount itself. dont loosen the middle screw as that keeps the whole knob together. dont overtighten the outer screws. it has several charts on how to adjust for windage for target movememt wind and elevation charts for temperature. its written very well text is presented in a very clear no nonsense manor that you would expect of a well written manual. it goes into deep depth on care and maintenance of the mosin 91/30. large print pages 114.