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What Is MOA
and Is It Really an Inch At 100 Yards?

MOA stands for Minute Of Angle. A full circle is divided into 360 degrees and each degree is divided into 60 minutes. Thus, there are 21,600 minutes in a full circle (360 x 60 = 21,600). A minute is a small angle, but it's exactly what's needed for gun sights. A rule of thumb is that changing a sight's elevation setting by 1 minute of angle changes the bullet's impact point by 1 inch at 100 yards. A more exact value and how it's arrived at is shown below:

A circle with a 100 yard radius (distance from the center to the edge) would have a circumference of approximately 628.32 yards or 22,619 inches (100 x 2 x pi = 628.32 {pi is about 3.1416}). Dividing the circumference in inches by the number of minutes in a full circle gives a value of about 1.047 inches (22619 / 21600 = 1.047). Thus, changing a sight's elevation setting by 1 minute of angle changes the bullet's impact point by 1.047 inches at 100 yards. And the bullet's impact point would change by 2.094 inches at 200 yards (1.047 x 2) and change by 3.141 inches at 300 yards (1.047 x 3).

MOA Diagram

Sight Adjustment Units Supported By Ballistic Explorer

 


National Shooting Sports Foundation video Understanding Minute of Angle (MOA) featuring Ryan Cleckner an experienced sniper team leader and sniper instructor. You can also watch it on YouTube.

 

National Shooting Sports Foundation video Understanding Mils (Milliradians) featuring Ryan Cleckner an experienced sniper team leader and sniper instructor. You can also watch it on YouTube.

 


More Information For Long Range Shooters

G1 vs. G7 -- The Real Story The Drag Analyzer shows bullet drag as a function of velocity and reveals the real differences and similarities between the G1 and G7 drag functions. You can also watch it on YouTube.

 

Custom Drag Functions Custom drag functions claim much more accurate downrange predictions than using simple G1 or G7 BC values. We put that claim to the test. You can also watch it on YouTube.

 

Ballistic Explorer is a trademark of Dexadine, Inc.   All other products mentioned are registered trademarks or trademarks of their respective companies.
Last updated: February 4, 2017
Copyright 2017 by Dexadine, Inc.