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Proper sight height is not difficult. Just
remember that the goal is to make the front and rear sights the
same height above the center of the barrel. And, when you make
your measurements, you MUST use a caliper or micrometer. You
must have a decimal answer (for example, .875) for the calculator
to work. A few
thousandths can have a substantial effect and this is no place for
a tape measure or micrometer eyeball!
Calculating Front Sight
Height
Step 1:
Measure barrel outside diameter, A, and put the dimension in the Barrel
Diameter at Rear Sight field.
Step 2: Measure total rear sight height, B. Put the answer in the Rear Sight Height
field.
Step 3: Measure barrel outside diameter, C, and put the answer in the Barrel Diameter
at Front Sight field.
Click Calculate and the Front Sight diameter, D, will be figured for
you.
Calculating Rear Sight
Height
Step 1: Measure barrel outside
diameter, A, and put the dimension in
the Barrel Diameter at Rear Sight field.
Step 2: Measure barrel outside diameter, C, and put the answer in the Barrel Diameter
at Front Sight field.
Step 3: Measure total front sight height, D. Put the answer in the Front Sight Height
field.
Click Calculate and the Rear Sight diameter, B, will be figured for
you.
Correcting Sight
Height
If your rifle or pistol is shooting high or low, there is a formula you
can use to determine what the correct height for your sight should
be.
Terms
Amount of Error: Measure in inches the distance from the bullseye
to your shot.
Sight Radius: Distance in inches from the front sight to the rear
sight. *
Distance to Target: The distance in inches from your shooting
position to the target.
Note: Be sure that your rear sight is at its mid-point before you
shoot.
Formula
Amount of Error X Sight Radius =
Sight Correction Needed
 Distance
to Target
If you are shooting low, you would replace your front sight with a
lower sight, and conversely, if you were shooting high, then you
would replace your front sight with a higher sight. Add or subtract
the number of thousandths needed to the actual height of your
sight and you will have the correct height of the replacement
sight.
Example
At 100 yards, your shot is 6" low and the distance between your
front and rear sight is 19.5".
6 X 19.5 = .0325
3600
Since you are shooting low, you would need to lower your front
sight by .032".
* For rifles, you measure the front sight
height from the bottom of
the dovetail to the top of the sight. For pistols you measure the
height of the blade only. This is true unless stated otherwise in
the sight specifications.
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