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Windage is commonly understood in MOA, which is expressed in inches. MOA stands for ¿minutes of angle¿ and adjustment increments are made by turning the scope turret. The scope on your rifle should show clearly which direction you should turn the turret to make whatever desired adjustment you may wish. Some less expensive models don¿t have that feature and you can safely use it as a barometer of quality.Rifle scope adjustable for windage.
Every click represents one minute of angle, which roughly translates into an adjustment of about an inch at 100 yards, but to understand why this is, it¿s probably a better idea to start by explaining what MOA actually represents:
If you remember elementary school at all, you¿re likely aware that a circle can be divided into 360 degrees. However, what you may not know is that each of those degrees can be divided into 60 minutes and that there are 21,600 minutes in a full circle.
Each of these minutes is in and of itself a small angle, but you can use these small angles to adjust you gun sights because this distance covered by the MOA is relative to the circumference of your target. To calculate the MOA:
In theory, knowing what this represents should allow you to calculate the MOA at any distance, but a good rule of thumb is that changing a sight¿s elevation setting by one minute of angle changes the bullet¿s impact point by one inch at 100 yards. How this translates to clicks on your scope turret though is something you¿ll need to find out on the range.
The thing you have to be aware of that is not all scopes are calibrated for MOA or precise to the inch. This means that though the theory behind MOA is carved in granite, how your scope incorporates that theory versus another scope can be vary greatly and you will not be able to gauge what a click means until you¿ve seen in it action. By way of an example, if I place a few shots about an inch to the right of where I¿m aiming at 100 yards using a favorite Leupold scope of mine, I need to turn the windage turret three clicks to the left (the scope should indicate which way to actually turn the turret in order to move the impact points in the preferred direction).
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