Satterlee arms makes intermediate, standard, and magnum length small ring actions in STEEL AND TITANIUM. The intermediate action is a clone of the small ring Mexican Mauser, but with square bridges. The standard length small ring is similar to BRNO M21, VZ33 and G33/40, but with square bridges. The magnum small ring is his own design, based on basic Mauser 98 design principles. His website has a lot of info, but is not up to date. Give him a call. He got severely back logged with orders several years ago, and pissed some folks off, but I believe he has smoothed out his operation. You may here folks talk crap about him, but I'd call and talk to him, voice any concerns you may have, and make your own decision. Satterlee actions come with the feed work for your designated cartridge already done to perfection. That's a huge plus!

http://satterleearms.com/375_length.htm

GMA makes a BRNO 21 type small ring action, but they don't advertise it on their website. Call them and ask about it.