Scope Mounting, Adjustment Notes, and Sight-in-Target    Over adjusting of elevation and windage may lead to internal damage of your riflescope.   If normal adjustments do not get the results you want it may be necessary to shim the scope.    Major windage adjustments require the use of an adjustable one piece mount. Best results will be with using the lowest profile mounts possible. The strongest type mount is a one piece mount. On spring piston airguns use a mount with a built in scope stop and use it if your gun is designed for it, if not use a separate scope stop. Use Loctite* on mounting screws if possible, if not black or dark nail polish works almost as good and makes it is easier to remove the screws.     Theoritical Scope Shim Guide   This is the calculated change various thickness shims will have at various distances.  Shims should be placed on the bottom of the rear ring for additional downward movement or bottom of the front ring for additional upward movement or the point of impact.  Actual effect may be different but should be quite close.  You will actually have to shoot in your gun and use the scope turret adjustments to get it to final zero.   Desired change in point of impact in inches Distance in Yards Shim thickness 0.25 25 0.001 0.50 50 0.001 1.00 100 0.001 0.50 25 0.002 1.00 50 0.002 2.00 100 0.002 0.75 25 0.003 1.50 50 0.003 3.00 100 0.003 1.00 25 0.004 2.00 50 0.004 4.00 100 0.004 1.25 25 0.005 2.50 50 0.005 5.00 100 0.005   Size the below target to fit on 8.5 by 11 paper and you should have a good idea of how much to ajust your scope.