I've done a Turk to 8mm/'06, and while it isn't as complicated as rebarreling, it can get expensive even doing the work yourself, (floating reamer holders will set you back a "C" note). As to loading, its gonna be a .30-'06 as far as data is concerned, and a .30-'06 die set can be converted for the price of an extended 8mm expander ball and new collet. Factory ammo is available, but likely you won't find it off any shelf. Even the magazine box might need extended to handle the longer round.
Its an interesting project, but if I hadn't already had a good Yugo 8mm, I don't think I'd have bothered.