ORIGINAL: cayugad
For the Renegade you can get a Green Mountain .62 caliber smoothbore. This is a 20 gauge. Get some Winchester plastic shot cups. Load 80 grains of Pyrodex RS or Goex 2f and 100 grains of #5 or #6 and you have an excellent shotgun out to 25-30 yards. It will smoke a coffee can. I have not been able to shoot a turkey yet with it, but intend to keep trying.
Also you can load a .600 or .610 roundball with an over the powder card, the ball, then an over the shot card and shoot anything big or small like deer out to about 40 yards. After that it is any ones guess where that ball will go. I do intend to load a .58 caliber ball into one of the plastic shot cups and see if I can extend that range to something further.
cayugad, are these the shot cups you are talking about?
http://www.winchester.com/products/catalog/components/shotshellwads.aspx