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I understand that calculating 1MOA at 100 yards is as follows:

(assuming pi = 3.1416)

Circumference in inches:

100 x 2 x pi x 12 x 3 = 22619.52

There are 360 x 60 = 21600 minutes in 1 full circle

So 1 MOA at 100 yards = circumference / 21600 = 1.0472 inches

The first time I took my father-in-law's 308 out to the range, my best group was about 1.5inches at 200 yards, so..

200 x 2 x pi x 12 x 3 = 45239.04 inches

1 MOA at 200 yards = 2.094 inches.

Now calculating MOA from my group size:

1.5 - 0.308 = 1.192

1.192 / 2.094 = 0.57MOA at 200 yards?

Is this correct?

Thanks