I had one once that was a 9X57R. Had the barrel slugged and it came out as a .358 grove diameter. I bought Norma 8X57 JRS cases, necked them up in a set of 9X57 dies and loaded them about like a .35 Remington. Worked fine, BTW.
What hasn't been mentioned is that the 16 ga. shot shell chambers were for 2 1/2 inch shells, not 2 3/4 inch shells. I had mine opened up to take the standard 2 3/4 inch ammo.
I'm really sorry I sold it. It's only flaw was the Greener side safety which was not very easy to push to the off position. Otherwise, it worked well. E
