From what I can tell, all the markings on the rifle add up to 8x57J, particularly the "8,0 N" markings that designate the 8x57J. I know rifles could be ordered in non standard calibers, so it's possible to have them in other calibers. I also found reference to another B with a 79xxx serial that was dated to 1914, so that would put it before the 8x60. Those chambered for 8x60 seem to be clearly marked as well. I'm going to take it to a smith to deal with that butt pad, so I'll see if he can cast it too.
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