Do they have laws against importing reloading components, specifically brass and bullets (not loaded ammo) ? Here in the US one can get good 8mm bullets for the same price as anything else. Good web sites are powdervalleyinc.com and grafs.com. Right now there is somewhat of an "ammo crisis" in the US, triggered by recent activity by the government and by some controversial ammo contracts by the local gestapo aka DHS. But I think you will find that you can get 8mm bullets for reloading.
Grafs has brass for $0.46 each Graf & Sons - 8x60S
and 8mm bullets Graf & Sons - 8mm (.323)
quite a lot in stock.
You might want to get a barrel slugging kit Meister Bullets Slug Your Barrel Kit 308-327 Cal Firearms
That way you could determine with absolute certainty the bore and rifling dimensions. That kit is back ordered, but they show expected delivery on April 16 so not long to wait. If you are brave, you could do the same thing with a good release agent and Pratleys putty. Push it through the chamber and into the bore. Let it set, then tap it out with a hardwood dowel or a brass rod. Just make sure everything is spotless and you use a good release agent...