Oskar's link to a dealer with B&P shells works fine. Trouble is, shipping to Alaska because of haz mat resrictions is very expensive. No stores here in Anchorage regularly handle 2-1/2" shells of any brand. I have talked with the good folks at RST about shipping here and they offered to assist but it still ends up with shells more expensive than I want to use. I mentioned the three shell types here because I happen to have them on hand.
Oddly, individuals like me legally pack a few boxes of shells in with our airline checked baggage when we can get them somewhere outside AK.
This all makes some of these old guns kinda tough to own and operate up here.
One the other hand, I do reload, and a fellow named Dave from the PGCA gave me a spreadsheet containing low pressure loads. Some of these 2-3/4" loads I use in my damascus Francotte (has long forcing cones).