How about this option. Tailor the smokeless load to the gun. There are any number of tested reduced chamber pressure 10 gauge, 12 gauge and 16 gauge loads out there that are perfectly safe to shoot in damascus guns with good barrels (as determined by a competent gun smith familiar with vintage guns). In addition to the satisfaction of shooting vintage guns in their original configuration you gain the satisfaction of producing your own ammuntion. I use turn of the last century tools which has increased my shooting satisfaction and connection with the original shooters of my vintage guns.
