Lucky and Sir Charles are right on the money. That is the site and I also have the book, I was trying to think what the title was and where it came from (mine is buried in a pile of junk in my 'office.') Both are excellent resources.
Both worth checking out.
I always been looking for a used 20Ga SxS shotgun and searched without success (they are pretty rare here in Australia and the ones you see are usually high dollar ones).
I have always been curious about 16Ga shotguns after seeing them as a boy realllll cheap as ammo was not available then. I bought a 16 about a year ago, but have had my tail in a sling for a lot of different reasons and haven't used it. I bought a slab of 250 and they mixed hunting and target loads, so I'm good to go ammo wise. Danged if I can get any brass shells and the ammo is expensive, I don't fancy trashing the hulls after a single BP load that would be an expensive process.
The problem might have been solved by my old mate, retiring from shooting, I have bought his 20Ga Grucelli which is looking like a contender for cowboy with brass shotshells and the 16 well be a critter hitter afield. I haven't got the 20 yet, there is some ammo with it apparently(I have a whole passel of slug loads I picked up when I bought a 222/20Ga Savage). So the 20 will be the cowboy iron and the 16 the hunting gun. That's the plan anyway, lol.
I like the idea of the 16, a real link to the old days, a hunting tool which would have bought a lot of food to the table.