Tarawa-

This MacNaughton is one of the coolest lightweight medium bore rifles I've seen.
I just really like it for lots of different reasons, for instance look at the chamber contour.

That's the original contour!
There are other neat features about this rifle, the best in my opinion is that it's an Edinburgh round action!
Also, the tubes run ribless to the muzzles, which feature an adjustable front sight.

I have a Cogswell and Harrison 8b stocked action, locks, and triggers - essentially the 'rear end' of an 8b double. I've thought of doing a 'super 12b' ball gun on that chassis, using this style of stepped barrel contour but with ribs.
I've seen C&H guns with this treatment too, so it wouldn't be totally out of fashion in the doing.

Just some images to get your thoughts churning, nothing else here.

--Tinker