Use Black Powder brushes, they have no loop on the end, but as said peviously, take the nipples out, it makes cleaning easier, plus it's good practice, otherwise they can get so fouled up that they are a pain to remove. I broke a nipple wrench on a club gun a couple of weeks ago, because nobody had taken the nipples out for months Managed to get them out after soaking the cylinder in boiling water for a 1/2 hour.
Use the proper tools and you can't go wrong.
ATB
Baz
Toys : .308 Rem 700 SPS Tac, 7.5x55 Schmidt Rubin K31, 7.62x54R Mosin Nagant M44, .45/70 Browning Mod 1885 HWTR, 8x60R Portuguese Kropatscheck, .58cal PH 1861 Enfield Carbine, .22LR-CZ452 Silhouette Tac, .22LR Smith & Wesson-M&P 15-22-M4 Carbine