Destry,
The Brothers P. would do some rather strange things in relation to barrel weight and frame sizes. My Grandfather's very early PH-Grade 12-gauge is on a 3-frame and weighs 8 pounds 8 ounces. While the barrels are quite thick right at the breech, they swamp in very fast. My even earlier 2-frame GH-Grade weighs a fraction of an ounce over nine pounds. The original 12-gauge barrels for my gun are very straight almost no swamp. This is the gun with the later fit set of 32-inch Vulcan brrels in 3-inch 20-gauge. They do swamp!