'Knute' - I'm confused by your response?

My family heirloom is a rifle, not a Fowler. (The barrel's origin is surplus Baker Rifle barrel).

The Iron barrel is of 'twist' construction, with seven grooves and approximately 1/2 rotation in 30 inches, (1 in 60" rifling twist).
The influence for the Baker rifle was the Jaeger Rifle, with its short, large caliber, rifled barrel.

The mold is stamped "19", for 19 gauge. The bore is approximately .65 caliber and loads easily with a .625" ball and cloth patch.

BTW - Flintlock, .62 caliber smoothbore, "Northwest" or "Mackinaw Guns" (intended market? - hint, hint  ;)) and Fusils were incredibly popular in the Great Lakes area, a.k.a. "The Northwest Territory", during the 'New France', British Colonial and post-Revolution periods.
These arms were ideal, being able to use shot or ball, for the game and distances, that would be encountered.