The goal here, for me anyway, is to do some research on general methods of loading the smoothbore as was done in the 18th century (1750-1790) with period correct accouterments.
Wads from old felted hats? Sure. The fear-naught, or shepherd's cloth that Mario's citation references is "A stout kind of woolen cloth, used chiefly on board ship in the form of outside clothing in the most inclement weather,..." A New English Dictionary on Historical Principles: Founded Mainly ..., Volume 4, page 116
So, heavy woolen patches? OK. Tow, moss, leaves, bracken fern (here in northern Michigan...) all good. Even paper folded up and lubed(?).
Speaking with a friend on the phone about this yesterday, I would shoot the fusil with a good, tight, properly lubed patched RB to see just how accurate the weapon could be, then use various PC/HC methods to see how accuracy changed. Remember, the goal is to take a fat deer this fall, in conditions and with tools common to that time frame.
More to come.