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Point of Impact Adjustment
Formula
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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 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.
