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Old August 3, 2013, 10:04 PM   #12
Shadow9mm
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Join Date: March 21, 2012
Posts: 51
I always used (weight x velocity x Diameter)/7000(grains per lb) to get my bullet power ratings. its not perfect but it does give me a good comparison, think it was in a "cartridges of the world" book but i cent remember for sure.
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