The TC Encore is one of the few that always worked with BH209. I don't think they ever even made a special "BH209 breech plug" for them. That was back near the end for TC when they were actually a competitive, innovative company. It's crazy to think how influential they were for so long, to how far they fell in just 15 years until closing shop. As for regular 209's, Federal 209A and CCI 209M are regular shotgun primers. Muzzleloader primers are weaker. Where you would find issues is something like a CCI 209 regular primer which is actually pretty weak, but many mistake them for the M version. Maybe somewhere, someplace someone got lucky. For most people, they get nothing but delays if not outright fail to fire.