I finally figured a round ball patch combination that appears to work. Tight fit but doesn't blister my fingers ramming the ball/patch. I can keep a group at 25 yards
But 50 yards isn't really a group. More like a general gathering. I can't rule out operator error. I don't have an experienced black powder shooter to help me along. What I think is a tight fit for ball and patch might be too loose. The musket isn't in that great of shape. I can tell the barrel 'opens up' a tad towards the breach end (chamber?). When ramming a ball/patch the resistance decreases slightly as it reaches the breach end of the barrel. Here is a 50 yard gathering:
The round at 10 o'clock was my friend shooting the last shot offhand. But several other 50 yard targets look very much the same as this one.