I'd look for a Husqvarna 640, Simpson's imports them in into the U.S. from Sweden in CONEX size lots.
www.simpsonltd.com Call them, ask for Floyd, and tell him what you're looking for and what you want to do with it.
I put together a matched pair of Interarms Mark X mannlichers in 7x57 and 9.3x62, using a Lothar Walther barrel for the 9.3x62. If I wasn't going to do a mannlicher, I probably would have gone with a Husqvarna 1600 series action instead of the Interarms Mark X.
EDIT: The large ring Husqvarna 640 actions are commercial style actions, no thumb slot in the left receiver rail or or stripper clip slot in the rear action bridge, that were made by FN for Husqvarna in the late 1940's thru early 1950's.
