A couple of thought on the S -vs- J bore possibilities for this rifle:

>>Regardless of what the marks are the best way to go about this is to make a chamber cast and slug the barrel. The chamber cast will tell you whether the neck area is likely to allow free release of .323" bullets (comparing that diameter to a loaded round, for instance) and the bore slug will tell you pretty exactly what bore and groove dimensions you are really dealing with.

>>One of the principal differences between J and S bores is the depth of the rifling, with the grooves of the S bore being deeper. The German loading manual "Wiederladen" (4th edition) gives some _current_ specs on this:

8x57J and JR bore 7,80mm - groove 8,07mm - giving a groove depth of 0,135mm (.005" or so)
These dimensions are also given for the 8x57R/360, 8x58R Sauer and the 8x72R

8x57JS and JRS bore 7,89mm - groove 8,20mm - giving a groove depth of 0,155mm (.006" or so)

The 7,85 and 8,15 marks on your rifle give a groove depth of 0,150mm (.0059" or so)

>>Given all this, my _guess_ would be that this rifle was intended to be an S bore, the fly in that ointment being that I really would have expected the "8x60" mark on your rifle to read explicitly "8x60S". The primary consideration is still the neck clearance!