KD, the first photo's perspective is deceptive and my use of the word "taper" may have been a poor choice. Here's a photo showing that the "taper" is actually a flat surface running the same plane as the top of the action. The rib dips below the area on which appears the name "J.W. Lewis" and rises to the bead. Shouldered the rib is below the barrels and action and not seen. In the "swamped rib" thread there was discussion of a concave rib. I suppose the flip side of a concave rib would be a convex rib. Dickson made 2" 12's as well. Gil
