you may have seen in my other post. in my knight LRH with the FPJ and the standard concave breech plug. i got about 5 hang fires. this never happened with 777. i was using w209 primers and 120gr of powder. i took the plug out and it didn't seem to dirty, i could see light through it. there was alot of blow back coming around the primer and getting on my blt face and was dirty and hard to clean up.
any ideas.