Breechplug

The muzzle was covered by 2 pieces of black electrical tape. There are a couple of plausible reasons for the hang fires.

ONE.......The carbon in the flash channel wasn't drilled out all the way to the flash hole.

TWO.........It is recommended one use magnum primer with BH209, and i don't.

I think making a deeper concavity in the breech plug will help with this issue.

When i first got this rifle i started with the crush rib sabot, because that is what i use in my Omega. They were definitely too loose. These Harvester smooth sabot are as tight as i want to deal with.