It really depends if the shotgun is choked or not. If its choked its hard getting the cards down the choke, so for my choked T/C New englander I use powder, 2 over powder wads, shot, another wad. These are flexible enough to clear the chokes.
For my fowler I use powder, over powder card, half inch fiber wad, shot, over shot card.
Check out the track of the wolf link, its pretty straightforward.
http://www.trackofthewolf.com/catego...37&styleID=120