"For game in general, comprising chiefly pheasants, partridges, and grouse, and assuming the shooter to be possessed of average abilities and physical strength, the following will be found the most effective weapon when shooting over dogs and the sport obtained is chiefly in the open: A 12 bore central fire, with 28" inch. English Damascus barrels, of which the right should be modified choked and the left full choked; patent snap fore end, double bottom bolt, extension rib, top lever, snap action and weighing from 6 1/2 to 6 3/4 lbs"
"For battue shooting, when a big bag is the order of the day, and actual sport a minor consideration, a piece which can be loaded and fired very rapidly is indispensable. On the whole, therefore, a repeating shotgun is preferable when battue shooting or driving".
Basil Tozer
Seems like somebody knew how to make light shotguns a long time ago, maybe we just forgot about this tribal knowledge. Author tends to promote the Spencer repeater gun for battue shooting. If you Google it, looks like a pump shotgun to me.