I shot real black powder at first. Actually, I cannot remember whether the problem started after I switched to Triple Seven (and then to Shockey). I switched because it was too much of a hassle to clean with soap & water. It also went again the grain to use water on a rifle. I also have an Austin & Halleck in-line. It stays far cleaner with the Shockey. It is therefore easier to load.

Maybe I will try the real stuff again just to see what happens.