Thanks to all for your advice . Looks like the only question now would be is there any disadvantage to buying the B and C retiicle From the responses, I would say no.
Other than a slight increase in cost, no.
I should add that if you want to, you can use the subtensions of the reticle to figure out exactly what each line corresponds to at max (or any other) magnification, and work out your DOPE chart accordingly.
I have found, however, that the booklet that comes with it works very well in common calibers. On both my 300WM and 7mm Wby rifles, if I zero at 200, the first line gets me on a 300, the second line at 400, and the top small third line at 450, as indicated in the chart below. That is at max magnification. On my 375 H&H, the same system works but at lower magnification, I think it is 6x.
For practical hunting at what are for most people realistic ranges, the B&C reticle is a great tool. If you buy it and don't use it, you aren't out anything except a few dollars. I was going to say "a few bucks," but that is ambiguous in this context.