Harry Baelder in Germany also makes really nice 500 Jefferys www.h-baelder.de

You could also check Waffenfabrik Hein www.rifleactions.com as they have announced that they have a new action for the 500 Jeffery. These are the traditional rebated rim versions and there are several other gunmakers who seem to be building these as members who are better informed than I am would tell you.

Best wishes and do post pictures of your rifle here after you buy it. Good hunting!