Very nice gun. I just completed my search for a British waterfowl gun as well. I picked up a solid gun from a more obscure maker, A.J. Rudd. I am very pleased with the one I found, but I wish I would have stumbled across the one you found.
Mine is also proofed for 1 1/2 oz loads, and marked 3 1/2 ton, which according to Dig's website uses a 10,427 psi service load. I have been scouring my bismuth reloading manuals and have found some loads that I can adapt to use in my gun. I have found that these loads are somewhat of no-mans land. There are reams of info on low pressure 2 3/4" loads these days, but not much for "lower" pressure 3" waterfowl loads. This would make for an excellent DGJ article, I wonder if Mr. Bell has any interest in these guns/loads.
