No mystery. If the bores are what you say, the gun was rebarrelled and the rebarrelling is mentioned in a missing book. When you sell a gun to an informed buyer, he looks at and measures the gun and uses the books and the letters as "related information". If a 176,000 range gun is rebarrelled, it is very likely that the rebarrelling occurred after the end of the order book period. Your gun is at the very end of the order book period.
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