Paco
For shooting shot from a smoothbore what you need is as follows .First is a 1/8 th overpowder wad this is seated lightly over the powder,if you need a feltwad which is not necessary with every shot this is placed on top of the overpowder card wad,these feltwads are mostly 3/8 or 1/2 inch,this is followed by a 1/8 card wad on top of the feltwad,always use a card on top of the felt if not with the discharge the shot will embed in the felt and will blow your patten you will also create a projectile ,I personnely only use a feltwad every 20 shots or when the barrel becomes too coked you can use a couple of cards instead over the powder and if the barrel is coked and there is difficult in ramming the card wad a bit of spittle on the second wad will help.Next is the shot and this is followed by a 1/16 overshot card wad.
Everybody has there own favourite load I always use a volume load for 10 to 28 gages, I do alter the load when using the big 4,6,8,9 gages
Feltwad
A Flint Lock will not secure a chicken house door