Talked to Don when i was trying BH209 with Win W209 primers and it hang fired. Ah ha! Drill out the flash hole with a #65 drill bit and you wont have any trouble. He was right too. I dont trust fed or w209s though. No poop in them.

You can use BH209 in a stock cva plug. Have my brother in laws rifle right here to bore coat and his still runs the factory flash hole. NEVER had a misfire in 3 cans worth of BH209 using CCI209M primers.