Having no 'sperience with shooting smooth bores, I agree with the knuckle ball theory.
My TC Hawken shot round balls amazingly well, but shot Lee's target minnie with amazing accuracy. Of course my eyes were 30 years younger at the time. And sadly (or stupidly) I traded the Hawken for something else which I no longer have.

RJ
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When you go afield, take the kids and please......................................wear your seatbelts.
Northwest Colorado.............Where the wapiti roam and deer and antelope run amuck.
Proud father of a soldier medic in The 82nd Airborne 325th AIR White Falcons