Joe, I've known you for many years now, and, IMHO you are always looking for an excuse to "just make something".
Can't say I'm a lot different in that respect, especially when it comes to them stinkin ol' smoke poles.
Keep us posted on your grouping progress!
Personally, I'm of the opinion that you will see an improvement in groups as you progress with this.
But then again, what would I know? I'm the guy that just totally gave up on a .69 cal. and was never happy with the "groups" I got from a very nice .62.
However, I am of the opinion that smoothbores are no different than guns that are rifled, in the sense that everyone is a science within itself, with no one single cure that covers accuracy in every Smoothie, just as there no one single cure for accuracy in Rifled Guns.
And, knowing you as I do, you are really going to enjoy this little journey....
Uncle Russ...