Most hunters have thought of a drilling at one time or another---I have---and my guess is that most of us decided that it's the hunt that counts, not having all tubes available to take all prey covered by hide or feathers.
Weight is always a factor and some hunters make a fetish of the lightest rifle and shotgun. Most of us learn that something in-between light and heavy is best for most situations. Drillings are generally heavier.
Consider, too, if your two barrels are smoothbore for birds, at what range is your rifle barrel intended to take boar, deer, elk, antelope or moose? Telescope sights are out. Drillings take too much from the magic and mystery of hunting for me.
My welcome also to the board, a good place of generously offered information and opinion.
