Have you considered shooting it as is, with some different ammo? While not likely, its not impossible it might pattern acceptably for your purposes (with a given load) as is.
Or, since the barrel has been cut, why not get one of the repo heat shields and make a faux "trench gun"?
By today's standards, the full choke on the old guns is extra or super full. Because the guns where choked full, using the old style shells.
My Grandfather "tested" full choke guns by balancing a dime in the muzzle. And it works in the old guns. However, put a dime in the muzzle of a modern full choke gun, and it falls right in.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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