yes swabbing is a must as usual. The 209 primers is what causes the crud ring issues. Clean up is easy. You do realize this is rebranded American Pioneer/Jim Shockeys gold powder right? Neither powders are in production after the last fire they had.
Fouling build up at the breech end of my traditional sidelock with BLACK MZ
How all 5 lbs of my powder came. I had to empty the jugs and lightly break apart the clumps.
if you are shooting an inline muzzleloader with the proper enclosed 209 breech plug, Blackhorn209 is the best sub black powder available that truly does not need to be swabbed between shots.