There are a large number of posts and topics on this,,,, plenty of reading available on the subject.
Many insist a "tight" patched ball is the only accuracy producing method.
The worst groups my TVM Early Virginia smoothrifle has ever shot was with a tight, and a moderately tight patched ball. As soon as I loosened the load groups shrank, a lot, like down to 3 or 4 inches at 50 yards (.595 ball with .010 patch, bore .615). Groups shrank more, becoming more consistent when I ditched the patch and loaded; powder, thin card, lubed felt wad, .610 ball, thin card. 3 inches consistently at 50 yards, sometimes less,,,, much less at 25 yards.
Not that in these discussions many people claim something "shoots good/well/best," and is the "best," or even "the only" way,,, but never post what their standard is.
Barely acceptable. IF, I throw out the 1st two shots. Tested at 50,,, no good,,, which I expected.
Hmm,,, might be getting somewhere. This load performed well at 50, but I still thought it could be improved. And after reading many reports of good shooting with wads and no patch, decided to try it seeing as this looser load worked well.
Sights still needed some regulation for height,,, but these are the groups I want at 25 before I test a load at 50,,, it performed well there and is my standard hunting load with that gun.
Progress with the Fusil des Chase. Could have been better at 50, but was acceptable. More tweaking in progress.