First, please delete all previous comments about S/N 47950 being a 10 Ga shotgun. It was my check procedure that was sloppy. I did not remove the barrels from the action and remove the extractor. Therefore, the snap cap was not fully chambered since it was engaged with and stopped by the extractor.
Second, I apologize for any confusion my comments may have caused.
With the extractor removed, both 12 Ga Winchester and Remington shells fit well.
Although I do not have any 10 Ga shells to use as a check, it appears that there is not chamber clearance enough for a 10 Ga shell to be chambered.
Actually, I am not at all familiar with the 10 Ga shell size or any other of its characteristics.
The 12 Ga A-Zoom snap cap seems to be a reasonable check tool as its base diameter matches the base diameters of the Winchester and Remington shells within .002 inch. The snap cap forward section is round with a diameter very similar to the factory shells. The plastic section of the factory shells is not quite round but both chamber fine in both barrels.
Also, please ignore the comment that the Parker Gun Serialization book might have a data entry error on page 202.
TC
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