rafsob
I had the kind of luck with 777 as you did with BH, I am sure there are some other things than the powder that causes these kind of problems, I worked a bit with 777 trying to find out what it was that caused it and came to the conclusion that it was a chemical reaction to something I was using. Since they came out with BH and it solved all those problems for me I never followed through on it.
have you tried the new Black Mag XP? I want to get some but have not been able to yet. If what I have heard and the advertising is correct it should work well even in the flint locks. Black Powder is very difficult for me to obtain here. Lee