I have 3 Knights that I've owned for several years. I used them for all my hunting. They all came with the original yellow disc; were modified to shoot the red full plastic jacket when they were introduced. I used 777 and Pyrodex and switched to BH209 when it was introduced. I had a few ignition problems until I changed to CCI 209M primers and bought a breech plug from Knight that was designed for BH209. I also made sure I was cleaning the carbon out of the flame channel in the breech plug with a hand turned drill bit. With that set up I was getting more blowback than I wanted and was tired of the extra clean up. Before hunting season last year I bought 3 Lehign bare primer breech plugs, changed to the Federal 209A primer and couldn't be more pleased. Much cleaner rifle, no ignition problems and great accuracy. Killed 12 feral hogs and 2 Whitetails. My current hunting load is 110 Grs of BH209, Harvesters' Black Crush Rib Sabots and 300 grain PT Gold bullet and Federal's 209A primer. I think you will be pleased with the change.