I am quite intrigued by your double, Yogi000, althought I'd prefer slightly longer tubes.

Up here, tradexcanada has a vast aray of double guns including the hammer Husky's that might be suitable for black powder level loads. Any time you can pick up a 1/2 descent double, over-under or side by side, for $250.00 or less, is a good day, especially when one is willing to build on it.

I was thinking one of those 16 bore Husky's might be a great gun for a round ball gun all in it's own, with tubes shortened to 24" or 26" and sights installed.