There is only one way.
Use the load you're going to use most & shoot at the indicated ranges, noting discrepencies (if any) from the charts. Charts are computer models only & don't exactly match real world conditions.
I have the Nikon BDC reticule & it is pretty good out to 300yds, but after that it diverges quite a bit.
Shoting at a fixed distance & calculating back the trajectory just gives you a different view of the computer model, again, not real world.
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Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”
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