The "swamped ribs" on the Smiths pictured by Drew are not what I understand true swamped ribs to be like. Well, the breech end of the rib isn't, anyway. That raised portion at the rear makes it somewhat of a hybrid, IMO.
The term "swamped rib" is interesting to me, in and of itself. The earliest use of "swamped", that I know of, is concerning muzzleloading rifle barrels. A swamped rifle barrel is an octagonal barrel that decreases in diameter from the breech to a point somewhere around two-thirds to three-fourths of the way to the muzzle, then increases in diameter as it continues, all the way to the muzzle. It was said to have enhanced carrying, and offhand shooting, characteristics. What is called "swamped" shotgun ribs don't necessarily do that. Strange.
SRH
