How do I determine my scopes true click value?
Sometimes a scope may not track exactly as stated. If your knob is calibrated for 1/4 inch/click (.250 MOA) the scope may actually track slightly above or below this value. For instance if the scope tracks greater than 1/4inch click (say .262 MOA/click), you will be hitting higher than expected as you dial up in yardage. This error will compound as you add clicks for longer ranges.
You can determine your scopes tracking by running a simple test. Zero your scope at 100 yards, then fire a nice group in the bullseye. Turn the elevation knob one full revolution up and fire a nice group again. If your scope is 1/4 MOA click 15MOA/revolution, use should have a nice group centered 15.7 inches above the bullseye group. If this is not the case, your scope will track higher or lower depending upon upon the distance from group center to group center.
Divide the distance center to center by 1.047 and divide again by your total clicks per revolution. This will give you the true MOA per click value of your scope.
If your 1/4 click 15MOA/rev scope results in two groups 16.5 inches apart, your actual click value is (16.5/1.047)= 15.75/60 =.262 MOA click
Determining your scopes true click value will enable us to build a knob for your exact requirements.