For the recoil curious wishing to work up gradually,
a 1400-gr slug at 1400 fps is easy with 3.5" plastic hulls in a
24"-barreled Mossberg 835 Ultimag.
Lead shot and epoxy fills the butt of the thumbhole stock for 14-pound bare weight of shotgun without scope.
With the standard pistol grip stock and no lead fill, weight is about 6 pounds lighter. Ouch.