I was right. The serial number is from about 1913, one of the last of the rising bites. Proof marks are 1954 rule (which went into effect 2/1/55) on Bohler steel barrels which are certainly not original. It's a rebarrel. My hunch is that this was originally a .303. Assuming a good quality rebarrel, and everything else in good shape, it's worth the current price. It is not represented accurately though.
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