Just got my first can of Blackhorn 209 to try with my Knight Disc Extreme. I set up at 50 yds. to try a few different bullet/sabot combinations and see how ignition went. First shot with 250 gr. Shockwave & Super Glide yellow sabot and Federal 209 A primer produced a hangfire and went 5" low. Not unexpected, as the fit was way too easy (read loose). Second shot was with a 250 gr. Shockwave with the standard black sabot and good tight fit. Ignition was fine. Third shot, with same bullet/sabot combination, was touching the second shot and good ignition. Other combinations, including Knight Ultimate Slam 250 gr. with yellow sabot and Scorpion PT Gold 260 gr. with crush rib sabot (also easy loose fit) fired fine w/o ignition problems and all shots touching. HOWEVER, I had 3-4 primers that DID NOT fire (not hangfire; no ignition). Not sure of cause as all were dented. Possibly damaged primer jacket inserting into red plastic jacket (difficult), bad primers (doubt), or firing pin problem. My first thought was to order a NFJP conversion, but I like handling the enclosed primers better! Any thoughts on cause of problem???