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Well, for example, Hornady .223 75grain BTHP Match. Hornady, on their website and in their standard calculator, only lists the G1 BC. I would like to use the G7 BC. Would that require special communication with Hornady or have I not used something correctly in their on line calculator?
I use whatever format they provide the bc in until Ive verified its wrong, it hasnt really ever been wrong. May have to adjust it a bit to line it up but it still works well enough.
If you must swap profiles and need a starting place I think the g1 will be about twice the g7 minus a hundredth and inversely the g7 about half what the g1 is plus a hundredth.
IN that case you most certainly are. Velocity is your primary driver there, adjust the bc in your solver and see what difference it makes, it takes a pretty darn sizeable change to put you off target at just 500.
My biggest bc correction ever was a .300 to .315, most standard bc adjustments if any would be like .300 to .305 just to get that target clal out at 1k to roll that one click down etc in the solver.