i would definitely take it to a smith who knew the older 'custom' rifles.

i read about a soldier who brought home an Arasaka from WWII and re-chambered it to 30-06 and hunted with it for years before finally discovering that he should have also changed the barrel.

it was said that the only reason it did not blow up in his face is the strength of the Arasaka action.

my point? check with an expert.