I also have a Lyman Deerstalker in .54 percussion. One of my most accurate traditional style ML's. I shoot a .530 PRB, with 90 grains Goex FFG. Never have ignition problems. Before initial loading, make sure ML is not already loaded, wipe bore, fire a couple of caps, wipe bore again, then load. You are good to go. I have the Lyman 57SML rear peep sight on mine. Nice set up.