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Old July 7, 2013, 08:20 PM   #4
Art Eatman
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Join Date: November 13, 1998
Location: Terlingua, TX; Thomasville, GA
Posts: 24,097
Looks to me if you've done all your homework and made notes, you'd always know the spin drift vs. distance. So, what's left is the wind.

I guess I'd do spin calibrating for 500 and 1,000 yards on a very calm day or on a day when a steady wind is in my face or at my back.
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