We all get different results. It takes me 5 minutes at the most to clean my gun using BH 209. Including the breech plug.

About the same time as cleaning BP from a Hawken.

BH 209 doesn't absorb moisture, is very consistent shot to shot, good power, no swabbing no matter how many shots you shoot, and no misfires.

That's my experience, and I can't say the same for any other powder for a ML.