The .348 did mean an end to the short lived .33 Win., but the .33 is still my preferred round. I can easily form them by running .45-70 brass through my .40-65 dies, and then into my .33 dies. Bullets are just as easy to find as .348 bullets, and though the cartridge wont perform as well as the .348, it's still plenty for most north american big game animals!
I have an old Marlin 1895 takedown chambered for the .33 Win. and it is extremely accurate cartridge in my rifle.
By the way, there are a couple of other cartridges that share the same rim diameter as the .348, though they aren't any more available. Both the .43 Spanish, and the .43 Mauser share the same rim size!