I had thought of this cartridge. I did look around for some "new" old surplus barrels. Another caliber I considered based on the .303 was the .338/303. Kind of unusual? I have a copy of "Big Bore Cartridges" and a short article is in there. I'm still waiting impatiently for my donor to arrive. I might go nuts in the meantime. If you're bored, check it out.

http://www.simpsonltd.com

It's item #z13333

It's old and beat up, but that's all part of the appeal. Simpson Limited has a very cool website! Thanlks for your input.