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Old September 10, 2012, 04:42 PM   #7
old roper
Senior Member
 
Join Date: June 11, 2007
Posts: 993
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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