Thanks Guys, here in New Zealand 'caps was dead and buried, but there is a move to resurrect it, as shooting numbers fall. We still get 2 shots per target, but the only full/full choked guns around are old brownings.Cheers-Graham.
I owned a Browning Broadway many years ago. When looking down the rib, things looked great. But, when shooting the gun, the very wide end of the rib became a wide front sight and I caught myself shooting off of the corners of the rib.
A narrow rib appears to me to keep your vision aligned along a narrow plane to the front sight and the target.