You would be better off looking at a multiline or multi dot reticle and looking at the distance between the lines on the highest magnification. Use that combined with your loads drop chart to determine what each line is in yardage terms.

Does that make sense? No matter how much a scope ad tells you it is load specific, it is not. Even if you buy a 308 reticle scope, it really means it was designed based on a theoretical 308 load, with a thoretical BC.

It may have a 300, 400 and 500 yard line, but even if you are shooting a 308, the lines will really equal impact at different yardages, say 301, 416, and 548. . .or something like that. Maybe using that scope on a 25'06 gives 323, 472, 598, etc. Also, at different magnification levels, this will change. So, maybe it is designed for a 308 at 14x, but it better matches 25'06 at 12x.