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Excellent article. I’d like to buy a few if we could get them here legally.
The .318″ groove dimension was for the original 8×57 in the model 88 Comission rifle. When they switched to the Mauser, they went to the .323″ barrel instead. I’m not sure of the time frame. I have read where they used to make sporting ammunition for the .318″ and the .323″ also.
Here’s a link to more accurate detail than I can remember.