Thread: Moa ??
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Old November 14, 2002, 01:00 AM   #7
Chuck Dye
Senior Member
 
Join Date: June 28, 2002
Location: Oregon-The wet side.
Posts: 949
On your scientific calculator, group size in minutes of angle is arctan D/R where D=group size and R=range. D and R must be in the same units. Your calculator will give the answer in decimal degrees which must be multiplied by 60 to yield MOA. Thus, a 1 inch group at 100 yards is (arctan1/3600)x60=0.9549MOA. Arctan or arctangent is probably tan to the -1 on your calculator, but I have yet to find a way to write exponents in this forum.

Don't forget that the standard for measuring groups is center-to-center. That is most easily obtained by measuring from the farthest most edges of the two most widely spread shots and subtracting the bullet diameter. A friend had been shooting 1 inch groups, outside edge to outside edge. Pleased with such accuracy, he was absolutely delighted when I gave him an instant 26% improvement in his (measured) accuracy!
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Gee, I'd love to see your data!
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