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Airgun Scopes

Below is some technical information for airgun scopes. This information is intended for an informational guide.  It is not instructional and we therefore assume no responsibility for those who use it without proper factory training.

Airgun Scope Mounting and Adjustment Notes

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.

Theoretical 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. Squares are 1/4 inch.
airgun sighting target
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