Brownells Brownells Brownells 75th Anniversary - A Shooting Heritage

Sight Correction Calculator

If you can’t adjust your elevation up or down enough to get the bullet on target, use the chart below to determine the amount of correction either positive or negative. Remember adding a higher front sight will bring the strike of the bullet down and using a shorter front sight will move the strike of the bullet up on the target.

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Sight Correction Calculator

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.