I do not shoot a CB any longer, but I did extensively in the early 70's and we would always put powder in cylinder and Corn Meal over that then seat the ball. The corn meal would almost ensure no chain fire would occur. This would also keep the ball from being seated too deeply in the cylinder. We would place grease, all purpose auto, over the RB. Worked well and never had a CF.
Illegitimi Non Carborundum