I asked this same question about a month ago (May 9th). I spoke with Blackhorn and TC about shooting bh209 in my BD. They both did not have an answer for me other than to try it out. I am up here in the north woods of Wisconsin and search all over the northwoods to find bh209, with no success. My local gun dealer is going to order a case in July.
What is real, real nice is that Blackhorn asked me for a list of dealers that I would like to have carry bh209 and they contacted the dealer. That is service.
PLEASE keep us updated. I have two BD and they shoot excellent with 777, which give me no desires to go out to buy new muzzeleloader. I think that this bh209 can give new and better life to an old design, only if it shoots as good as you all say its been doing.
It would be nice if TC or some third party would design and sell a new enclosed 209 primer holder for the BD, if that is all it requires to shoot BH209.