Following up on dZ's suggestion of a nice antique flintlock one:
http://www.interart.ca/misc/Images/ss0127.jpg
A REVOLVER with a 12" barrel and a massive cylinder packing five 20-gauge shells of #3 buckshot. Muzzle energy would be about 1.4 times that of a .44 magnum though the felt recoil would be less due to the guns weight. A lighter load {12 pellets vs 18 at 1200fps} would lighten up the recoil.
Stainless so it could handle being in a bedroom with humidifiers.