Ive never had much luck with the free strelok past 300 yds it always fails to predict real world results with the measured data mv and manufacturers bc. The one i trust implicitly is an exel spreadsheet one by Professor Arthur Pejsa, a physicist who worked for honeywell and jpl and wrote a number of books on ballistics, it has predicted results for my 6.5x55, 308, and a friends 300 winmag out to 950 yards that have been verified with drop tests. Its only drawbacks are a) its in exel and you need to know how to use that, b) it stops at the transonic point, and c)my phone wont run exel, but the programs setup to print out drop charts in any increment and I carry laminated ones on the stock with 15 k wind deflections at 90degrees which i can fiddle in my head for different speeds and angles.
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