Guys, I am the guy who started this topic, and now I will end it. My only purpose was to get increased range from a Beretta Tricentennial muzzleloading shotgun that cannot be choked. Let me also say that I am not a 'Mountain man' or primitive hunting re-enactor. I am a very experienced bird hunter. My friends and I hunt only wild birds and we are very competitive. I decided to raise the bar by eschewing modern shells and hunting with a muzzle-loader. The only idea I had was to use plastic shot cups to hold the pattern density out to 30-40 yards. Some of the comments were a bit snotty, but most were VERY helpful. One of the last comments was a link to a video showing how to use corn muffin mix to extend range. Danged if it didn't work! I got my answer about extending range, I won't use plastic, and I am very grateful to all who commented. Thanks to you all for your help.
This is all about a hunt coming up in December next year. I will be chasing wily late season pheasant and sharptails with "Ugly Betty'. I am leaving my Benellis and CZ's at home in favor of black powder. After the hunt is over I will try to post a video of me nailing wild sharptail grouse and pheasant with 'Ugly Betty'.
Again, thank you for all of your comments and ideas.