Handgun scope mounts made in the USA

Point of Impact Adjustment Formula
For Adjusting Front or Rear Sight Height



Point of Impact Adjustment Formula
Copyright 2004 Jack Weigand 


FSHC= SR x PIA / DTT

FSHC= Front sight height change

SR= Sight radius

PIA= Point of impact adjustment

DTT= Distance to target


Sight Radius
(SR)
Point of
Impact Adjustment
(PIA)
Distance
to Target
(DTT)
Front Sight
Height Change
(FSHC)
X / =

FSHC

This dimension will be expressed in .000 (thousands of an inch). This will be the amount of material to be added or removed from the front sight blade.

If the point of impact were low then material would be removed from the front sight

If the point of impact were high material would need to be added to the front sight (or removed from the rear sight)

SR

Sight radius is calculated from the reward most portion of the rear sight to the reward most portion of the top of the front sight in inches.

PIA

Point of impact adjustment is measured in inches from the center of the group shot to the point of impact desired

DTT

Distance to target. The formula needs this dimension to be expressed in inches. Longer distances give greater accuracy.
We use 25 yards as a standard, which is 900 inches.






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