RE: Nikon Prostaff BDC
I have the BDC on my 204 now 6-20 monarch target, and I do not like it much. I would rather have mildot. You have to shoot the distances and find the power on the scope to match up with the rings and remember that. So you might set your scope to 8 power for 500 yards, or 10 power for 400 yards.
With mildot, you can keep power constant and know go down 3 mil or whatever for various distances.
They say you can use the top of the ring for various mil drop.