A couple of my latest practice projects.......
The good and the really ugly on the right due to contamination from trying to retain the rustic nature of the metal.....I ground another 1/8" clearance before doing the left bead.
The fun one.......
Insert 5" of cannon fuse, 1 tablespoon fg black powder, one piece of damp paper towel, then pack the remainder with damp beach sand and stand back.