Brendod H
This web site I have used for Rifle Ballistics, for some time and found it to be pretty accurate at least compaired to mfg. published ballistics anyway but the nice part is you can play with the input to compare loads for performance with out pulling the trigger, you need the BC of the bullet in question, the altitude of your location, (not hard to find), the height of your sight above the bore, and the yardage you want the ZERO.
http://www.biggameinfo.com/BalCalc.aspx
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