I once had a set of Tikka 512 barrels for my 412 valmet that had been re-chambered for 30 Super FL, and they were excellent...no problems found in the re-chambering. I sold the barrels in a moment of looming poverty, much to my dismay...only because I still have a set of '06 and of 9,3X74R.

What you need to watch for is the extractor configuration...will it work for a rimmed case? The extractors on the Valmet/Tikka guns are so simple that they work perectly.

It is a great re-chambering in my opinion.