@Marty Henry, might be worth doing a side-by-side comparison of several different ballistics programs.
I've just done a quick n dirty with Strelok+, Sierra Bullets Infinity, Professor Pejsa and Hornady, and they are all within a tenth or two of an inch at 300 yds, and within an inch or so at 500 yds.
I haven't got the Strelok free version, but I can't imagine that its got different algorithms for trajectory?
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