Do first shots hang fire, or later in the string? I know that carbon buildup in the channel of the nipple/breech plug area cause hang fires. Use a snug fitting drill bit to clean the channel at a regular interval. CVA just started selling special breech plugs just for BH209. Ramshot recommends drilling out some breech plugs to a slightly larger diameter for better ignition.
I shoot an Omega and a Sidekick with BH209. Never had a hang fire, but I keep them clean and I use CCI 209M primers which are the hottest going.
