I have a few original fowlers/shotguns (both single and double barrel) and was thinking of trying them on duck. I'm thinking steel shot would be hard on those old barrels, but what have any of you done in this situation. I know bismuth may be an option, but it is expensive. I do own a reproduction Navy Arms double with modern steel and chrome lined bores, but I would really like to try my luck with one of my originals if possible. Any advice of suggestions would be appreciated.