All above is from old timers who know what they are talking about so what I can add is little.
If you have shot your gun enough so the barrel is polished or have polished it with JB Bore paste it will shoot two or 3 times with hunting accuracy, it will not have the fine group that wiping each time gives but it should retain what we call minute of deer accuracy.
I have two of the same rifle I had to go to the .535 ball to get the best accuracy, I also went to 110 grains as it gave me tighter groups at 100 yards and over and put deer down faster so I did not have to track them so far. I use RS Pyrodex.