Nope, it will prove alot different. The Bess is a cylinder bore, no choke. Your Tom will have to be right on top of you for you to get a killing shot if all you do is use the standard wad, shot, and overshot card. Not to mention that Pedersoli is notorious for low set touch-holes, so your Tom will have a split second to move when you touch it off. You'll have to concentrate on keeping the bayonet lug sighted on the bird.
You need to pattern the gun first. Remember that a heavy powder charge in a BP smooth bore is not necessarily better than an average load. It might actually harm the pattern. I'd suggest a 2.5 dram load, 70 grains of 2Fg.
I'd also suggest you try to find lead #2's, and if you can't in no way use anything smaller than #4's. You have to get more "work" out of each pellet as the pattern will be so large you'll have less pellets on the bird.
Plastic shot cups are NOT compatable with BP. They melt and leave crud in the bore, and are a b@#ch to get out of the barrel. They are also designed to work with choked barrels.
I have seen some good results from a paper cartridge. It acts like a shot cup, but holds the shot for a split second as it exits, giving some extra yards. You'll need to make a cartridge form from a wooden dowel. You'll have to sand it down so that a couple of wraps of good quality bond paper will still fit down the barrel, snug against the sides without tearing. (I use paper from old hardbacked novels I buy at the library for $1) You make the cartridge tube, but fill it with shot, and gently ram it down whole on top of the wad, instead of tearing it open and pouring the shot down the barrel. IT acts as its own overshot card. When fired, it ruptures just after it exits, and the delay in the spreading of the shot shorta acts like a choke. When it works it acts like an IC choke instead of a cylinder bore.
Here's a link to rolling a bess cartridge in case you don't already know, and also for anybody else interested. They use newsprint in the example. Bond paper is the key for shot for extended range. (I use bond paper for both powder blanks, and shot charges)
Cartridge
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