Yes! It is possible to rechamber the 94 for the 307Win round. You will have to use a premium bullet like a Nosler XFN. I don't know if they are available in factory loaded ammo. Maybe somebody else here would. Most flat nose bullets are designed for 30-30 impact velocities which are much lower than the 307. Factory ammo will probably be hard to find so you may be forced to load your own. Good luck with it though. I might even look into that myself.
By the way, all this info came from Shooting Times (Nov. 2000). And my wife says I never use these back issues.:-) If you want to read it yourself, Check out
www.galleryofguns.com. There is a link there for Shooting Times. The article("20 Great Loads for 10 Top Rifle Rounds"
Should be available in their archives.