Many Thanks, Gentlemen - Since all my BP Percussion Muzzleloaders have no choke whatsoever, I will assume I can shoot prb's through them. This isn't a stretch, since modern "replica fowlers", both flintlock and caplock, are used for ball as well as shot.
This was my "gut" feeling, I just wanted to run it by to see if I was missing anything. Actually, my only concern was the possiibility of a solid mass generating more pressure than loose shot, but evidently that doesn't hold water.
Thanks again - Marc