blammer is right, pretty much any post 1940 m48 or k98 will be just fine.
The bore diameter and reciever tolerances are the main reason US mfgrs won't load 8mm to it's full potential. Actually, it all comes down to that one potential lawsuit. Honestly, they're more afraid of the $$ lost from that than the $$ gained from providing a good 8mm load. I'm not blaming the US mfgrs one bit, it's just a fact of life/business nowadays.
Get some S&B ammo, Wolf Gold, Norma or do what i plan to do in the future--handload.
Other than the impotent, anemic US loads, the 8mm is an unbelievably awesome, and proven, round.