The barrel slugs 0.349/0.358" 6R rifling
The 9X57 ammo I bought from Buffalo Arms has 0.356 bullets. I'll be able to reload it with U.S. 35 caliber bullets. They used 35 Whelen cases, shortened. I use 8X57 PPU brass. Once through the sizing die (& expander ball) and, presto, I have 9X57 cases (with a misleading headstamp).
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