I found using a wad between the patched ball and powder reduced accuracy in all barrels tested, except for the 14 bore. Your results may differ. This amounts to the individual gun and it's preferences. I assume with the barrels that lost accuracy, had I retested a variety of loads, I'd have come up with a hunting load that would have duplicated the original patched ball's accuracy. It may take another 5 or 10gr. or perhaps 5 or 10 gr. less - perhaps one would even use a looser patch? Testing is the only way to find out. There are no 'pat' answers in this game.