I cant for the life of me figure out if this stalking rifle is 9.3x72r or if its a variant of that cartridge. I read a good number of threads on the 9.3x72r changes but the case dimensions dont seem to have changed enough to prevent older guns from chambering modern 9.3x72r ammunition
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proof mark

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wax cast and case


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*this is a factory new case, not loaded ammunition or fired brass
*I know the caliper says .320, I re-measured it in a more stable position. The measurement came to be .312. This obviously doesnt include rim thickness

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Slugged the bore with a .40cal soft lead musket ball. Groove is .365-.366"

Looks like i need to cerosafe it. I'd really like to use this rifle for opening day. Has anyone had success ordering 9.3x72r reamers?