"Fooling with patterns is for the expert."
I've read that, with muzzleloading shotguns, one can change up the pattern a bit by changing the powder charge vs shot weight
From what I found on the net, a cylinder bore ought to give a 26" pattern at 15 yds, 32" pattern at 20 yds, and 40" pattern at 25 yds. I'd certainly like to tighten that up if possible.
I don't know how much can be changed by changing the load, but I'd give it the ole around the block.
I've also wondered just what a smith can do with a side lock barrel as far as giving it a choke. Or even threading a modern choke in (ducking). Problem, of course, would then be the gauge. I'd certainly need to go with a 28 ga as there couldn't possibly be enough meat to bore it out to a 20 ga.
And I've considered 28 ga as it sounds so petite, but frankly, being a muzzleloader, I could still pack an ounce of shot in there... I don't how limiting that may be for hunting certain animals though. But then again a 24 ga may not be big enough according to the regs...