App will help you to adjust iron sight and determine optimal ammunition or twist rate which perfectly suits your gun.
Includes the metric system and the imperial system converter.
Example:
at 100 yards, your shot is 6" low and the distance between your front and rear sight is 19.5".
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.

To calculate stability factor (SG) you need to enter parameters of the bullet: weight, caliber (diameter), length, velocity, and twist rate (will be calculated for a standard ambient temperature of 59°F / 15°C, atmospheric pressure 750 mm Hg. humidity 78%).
If SG is less than 1.0, the bullet will not have adequate stability.
Between 1.0 and 1.5 marginal stability.
SG of 1.5 or greater ensures adequate stability.