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Old October 23, 2011, 10:11 PM   #5
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Join Date: March 14, 2010
Location: Oklahaoma City
Posts: 538
I have not looked into the book (I don't have the Speer book) but you may want to look at the C.O.L. there might be a difference between the two and that could explain the difference in variances between the two loading ranges. Bullet shape could be another.
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