The only time I shoot round balls is in competition. [54 cal Lee Improved Minie is used for hunting] Through experimentation from the bench I learned this drill gives me best long run results. Same drill is used for 40, 50 and 58 cal rifles.
Before loading first shot swab barrel out with patch wet with 100% alcohol to remove the Ballistol or WD40 rust protection. Load and fire one round to foul barrel.
From then on, clean between shots with both sides of one patch dampish (not wet, just damp) with a simple version of Moose Milk. Two cycles up and down on each side. Then dry with both sides of a second patch. Drying patch is saved to be the damp patch for next round. Load and go.
Simple Moose Milk recipe is 2 fluid ounces of Ballistol, 2 ounces of Murphy's Oil Soap, water to fill the reused liter pop bottle.
I cut my 2x2" cleaning patches from Osnaburg fabric. I think the coarse weave has some scrubbing action.
White Fox, in the People's Republic of Boulder