If you are just a little off in the first band with either the BC or the velocity limit, then you enter the second band needing to catch up and if you do not catch up with either the BC or lower velocity limit then you are really in a major bind by the time you get to the third band.
My personal problem is that I hate to reduce the BC low enough in the first band because I do not wish to believe that the bullet I am shooting has such a low BC. I really like to live in a fantasy land where my bullets have super high BCs.
Here is a picture with the problem that I encountered when I would not lower the first band BC enough and stretched the lower velocity limit too far. Out to 1200-1300 yards I am seldom off by very much, but at the longer ranges things come unglued.