Hi Red Owl,
A couple of years ago I compiled a suite of measurements on all of the long rifles (rifled not smooth rifles) I had access to or for which measurements were published that were made before, during, or shortly after the Rev War. I think I ended up with about 46 rifles. The average caliber was 52, barrel length- 42", barrel width at breech - 1 1/16", barrels octagonal swamped, stock - maple, hardware - brass, patch boxes mostly 4-piece brass, modest carving, <1 brass inlay other than patch box.
dave