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Group spread from temperature...
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September 10, 2012, 04:42 PM
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old roper
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Join Date: June 11, 2007
Posts: 2,155
Need to read this
http://www.exteriorballistics.com/eb...ned/5th/31.cfm
http://www.accurateshooter.com/techn...-air-pressure/
http://www.hornady.com/ballistics-resource/external
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