Give "Card, Wad, Ball, and Card" a try. Most smoothies love it.
I have two 12ga doubles (Pedersoli & Peta). For flinters, I have a .60 Canoe gun from Jackie Brown, a TVM Fowler, a new 20 Ga. Double, and a Smooth bore rifle made from another TVM fowler.
All of them shoot tight groups with a over powder card, a wad, ball and another over powder card. I used 20 ga wads & cards, a .60 ball and varied powder loads until I found "Mrs. Right".
In fact on my last lil trip to the range to work out a load for the smooth rifle, I fired about 35 rounds and every one could be loaded with thumb pressure only. Never had to send a brush down the tube, or fight with a ram rod.
That in itself made the day wonderful. Plus, I got the group down to one ragged hole (1 1/2") at 25 yards. Gawd, am I in love!
We all have our druthers, but play around until you find yours. And no matter where you go... Cards N wads, Patched ball, paper cartridges, Leaves, wasp nests, denim, or seersucker... Just have fun with it.
Enjoy that new toy, my friend.