There are surplus 8mm barrels aplenty, find a gunsmith that does a lot of rebarreling and there will probably be a pile of them in the corner. Pick out the best one and go!
I have a mauser that has been rebarreled to .250 Savage, cartridges go in the chamber like they've been greased with pig snot
So, I'd guess anything in the .308 class should be fine for a rebarrel. My dad did another turk as a .308 without any problems. You never know, though.
Have another mauser that now wears a commercial .30-06 barrel and I can't see anything wrong with it, either. Killed a pig with it.
I have a mauser that has been rebarreled to .250 Savage, cartridges go in the chamber like they've been greased with pig snot
Have another mauser that now wears a commercial .30-06 barrel and I can't see anything wrong with it, either. Killed a pig with it.