Larry,
Before getting too carried away. Get out some precision measuring tools and see what the actual chamber diameters are. Just because the book say's your gun should be a ten gauge doesn't mean it actually is one. These are old guns that have a had a lot of time & different owners who could have had them modified. It's not totally out of the question that Parker had an order for an 8ga and all they had in stock was a ten that they could rechamber and bore to 8ga to fill the order.
I have a 16ga Damascus gun that the serialization book says was shipped with 31" barrels. The letter states it was a stock gun that Parker cut the barrels to 30" before it shipped to fill an order and then never changed the stock information in the books. Your gun may have had something like this happen to it.
Measure it up and order a letter if you don't already have one.
Just my thoughts,
Paul
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