If you're thinking about this classy style of coving, you have a variety of corebox bits to choose from. Depending on the width of the cove, it's obvious that the wider the bit the shallower the radius in the rout. So as dasein668 sez, you don't have to go deep to get a nice effect.
I wonder what is the best width for a cove stripe? Anybody know? It could be too narrow, or too wide for that matter....?
And what the hell is a corebox? Isn't it a 'coving' bit?