I have a number of black powder era doubles and a few early smokeless with short chambers with forcing cones designed for paper wads. I cut plastic hulls down to 2-1/2" and load black powder or BlackMZ for those that are black powder guns and light loads of Red Dot for smokeless era guns. Shot load is 7/8 or 1 oz. I use plastic wads and roll crimp. As I can reload, I can make the loads work for the gun. I really don't need heavy loads anyway.