For CCW, excessive. If you actually need that many magazines, you should have had a rifle. If you should have had a rifle, you should have avoided the situation altogether. I can't think of any public civilian defensive situation that would require 77 rounds. I imagine that if you actually used your gun defensively and the responding officers found you with that much extra ammunition, it would be pretty easy to argue that you were looking for a fight.
I typically have between 7 and 12 rounds total, depending on the pistol.