Heather Finnell of Burning the Midnight Oil Quilts has a great tutorial for binding quilts that includes instructions for how to finish the beginning/end of the bindings so that spot looks the same as the other joins in the binding. You'll find it here:http://www.burningthemidnightoilquilts.com/pdf/binding.pdf
I admit that because of the idiosyncrasies of the sewing machines I have in my home and because of the relatively thin batts I prefer, I usually subtract 1/4-inch from one end of the binding so that the binding is stretched ever so slightly over those joining inches. However, I don't measure the quilts to be sure their sides vary by no more than one millimeter, and I'm not entering most of the quilts I make in competitions, so no one is going to get too picky with them; most of my quilts are prayer quilts that will be laundered countless times over the course of their existence.
Happy quilting.....Happy blogging.