I don't shoot blackpowder (too messy for my liking), but you're thinking of what is normally caled a "blunderbuss". There are still a few reproductions of these made (mainly in Italy), and the point of the "bell" at the muzzle wasn't to spread the shot pattern out, but to make it quicker to load; since you had that wide muzzle to work with, you could just drop in your powder charge, then follow it with whatever size of shot you wanted.
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Gun control in Canada: making the streets safer for rapists, muggers, and other violent criminals since 1936.
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