Yeah, y'all get a lot more of the classics than we do for sure (he said while drooling) They're fairly rare here. Usually more in collections than actually in use. That said, I wouldn't feel undergunned with that .243 over 12 you mentioned. At least not here in the East. The one pictured would certainly be acceptable over most of the continent.
I can certainly understand how the trigger would be a bit complicated and finicky though. Still.....I'd love to have a play with one.