BTW: I'm pretty sure these are all .323" diameter bores(?)

I have 2 of the 88 Sporters both in 8x57. Mine are .318 but I've been told .323 barreled guns are around too.

re: the rifle in the pic:
The squared/flat profile of the trigger guard does suggest the 88 over most anything else. Even the Mannlicher sporters are a bit rounded back of the mag box.

Now I'll have to drag mine out and gets some rounds loaded for nice weather. No gold around here to look for though.

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Is that a hatchet perhaps on his belt on the left side or some other tool or weapon.
Can't quite make it out.