Over the years I've picke up a few hand made replicas of civil war cannons and mortars. My half scale Napoleans have 30" barrels with 2.5" bores. My biggest mortart has a 3" bore. I have no intention of firing a projectile though them, but would not be opposed to creating a good share of smoke and fire. All are drilled for fuse holes. A buddy told me to get a wooden dowwel of appropriate diameter and wrap the end in tin foil. Pour in a couple oz of FFG, close up the end, drop the package down the tube. Put a fuse through the hole and through the foil and light it. Is it that simple, Artillarists?: