On February 1st this year - I got an email from "Gordy Edwards" at Knight Rifles - and he assured me that the breech plug - part # 900046 - for bare primers, is made specifically to solve any problems with shooting BH 209. He said, he has been shooting it for over 2 yrs. with great results.
I have a Knight Vision rifle and also the new bp - but due to the deep snow, our shooting range is closed and I have to wait till warmer weather to try it out. I like the extra weight and the way the Vision comes up so natural - it feels real good and I think I'm gonna like shooting it better than My TC Bone collector.
Ditto, on keeping that flash channel clean. I use a 1/8" drill bit - just in my fingers - every 20 shots or so at the range. It's a must.