kdross,

I looked at the photos of this Purdey on Roger Bain's website. For what my opinion is worth, I think it looks like a pretty decent gun. It's nearly impossible to evaluate a gun without handling it, as you surely know. I advise you to have a knowledgable expert evaluate it. That person will do a thorough inspection, including measurements of the barrels for wall thickness, etc. If the gun is sound and on-face, you will have one to use and enjoy for many years.

And by the way, yes you can shoot 2 1/2" shells in 2 3/4" chambers.

Good luck, and report back with your success!

Curl