Browning Buckmark scope mounts

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

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 rearward most portion of the rear sight to the rearward 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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