I used to make "nitrated" papers out of cigarette papers soaked in KNO3 and dried, leaving the gummed portion untreated. Even with the enhanced combustibility I still carried a pair of small tweezers to remove occasional remnants of unburned paper from the chambers. I found that if I broke open the paper before inserting the round I got more reliable ignition and burn. I now just use a flask charging all 5 or 6 chambers, lube wadding all 5 or 6 and ramming home the balls or conicals.