Bronko you might be right but I would have to disagree with you about the round ball. I shoot round ball all the time out of my inline muzzle loaders. Especially my Knight LK rifles. The trick is not to push them too hard.
The star marked hits were with the UC Short Mags. I later learned if I changed to 777 2f the group tightened right up. But the center hits were with round ball. With 70 grains and a pillow tick patch and some moose milk that rifle really laid the ball in there. I am positive that wih 70 grains and a round ball I could deer hunt with that rifle.
Now I admit, I didn't shoot a lot of round ball at longer distances. But 50 yards and under, they are real accurate "Off the bench rest."
Next time you are on the range, try some round ball in one of your fast twist rifles, just for the fun of it. I would be real curious of your results.