Have some dies enroute from a member here. Slugged the bore at .358. Already picked up some old Knyoch rounds to disassemble. Looking for some additional 9mm head stamped brass but I have some 8mm if needed. I’m hoping to find some free time in may/June to hit the range and do some load development. Heading to maine in august so anything that’s consistent at 50 yards will work for that trip.
You hit the jackpot with the bore size. Plenty of 358 bullets that'll work just fine! I recommend the 250 gr Hornady RN bullet or a good cast bullet if you want to go that route.
I didn't bother looking too hard for properly head stamped brass when it became obvious what it would cost. I just ran a hundred round bag of new 8X57 brass through the 9X57 sizer and started shooting!
Hope that beauty shoots as good as it looks....