The Elevation Sight Angle is the angle of the barrel from the light of sight through the gun sighting system. When the barrel and sights are perfectly parallel the angle is zero. A typical rifle with a zero of 100 yards might have an sight angle of 4.00 minutes of angle (MOA) as shown in this picture:

Elevation target turret.

The calculation of this angle is the primary purpose of this program. The angle given includes the "Sight Angle Offset" which is part of the "Firearm" settings. If your rifle scope mount does not have a taper mount or is shimmed there will be offset associated the indicated sight angle on the scope elevation adjustment. See Firearm Help for obtaining help on calculating the offset for your firearm.

Windage Sight Angle is the adjustment necessary to accomodate the side motion of the bullet due to the wind. A positive number indicates you should move your point of aim to the right. A negative number means you should move your point of aim to the left. The program assumes the wind is entirely a horizontal component relative to your line of sight. This is almost always the case when shooting parallel to the ground. When shooting across a valley or up/down a mountain this may not be the case. In those cases the wind may affect your elevation settings as well as your windage settings. You may need to apportion the windage adjustment indicated by this program to both windage and elevation adjustments on your scope. The value is given in both minutes of angle (MOA) and Mils for rifles that have a Mil dot scope reticule that looks like:

Mildot reticle.

For more information on Mil dots see The Truth About Mil Dots.

The Target Lead is the angle, in Mils, ahead of the target you need to aim to hit a moving target. The target velocity and direction are part of the "Targets" settings.

The time to target is the amount of time in seconds it takes the bullet to reach the target after it leaves the muzzle.

The maximum range is only approximate. This is the maximum range the bullet may travel if fired at the optimal angle of about 30 to 35 degrees up from the horizon.

For more information and the use of the desktop version of Modern Ballistic see the manual for Modern Ballistics.