Jagermeister:
The 5.6x52R chambering was their "best guess". This may be based on a chamber cast or possibly just a visual. They do both, but not to all guns. But I like mystery cartridges. No American gunsmith has touched this, as it is recently imported from Sweden. I am still holding out hope that the left barrel is a guage rifle. And if the insert was just a drop in, I am good to go. If it has been buggered up, then I have a single shot or project gun.