bsteele,
If you are in the market for a 9.3x57 barrel, I suggest you give Simpson Ltd. a look. Most of what they have in that caliber are on Huskys and are round. However, from time to time, they have other makes, which may have Oct. to round barrels with rib. The most economical would be one with a barrel and/or stock bad enough you can stand taking it down. Even then, you should have them measure the muzzle diameter first, to insure there is enough room. In the long run, you might be better satisfied to buy a blank and have it milled to the contour you want by one of the good young makers like Nathaniel Meyers.
Mike