In various periods of Parker production, guns of various types and sizes were patterned at the factory with various loads, at various ranges, with various weights of various shot sizes, at various size targets. Sometimes the researcher will have the results of those patterns available to him, but more often not. The reason is that the stock books where the pattern information is posted are too big to fit on a normal Xerox copier. The pattern information is usually on the end of the page which was not included in the copies. The size of the page already required two trips across the copier, so the third section was not copied. The information included in your PGCA letter was from the "order book", which does not imply that the information included actually followed to the finished gun. Only "stock book" information refers to the finished gun. Both documents are used to create the PGCA letter. Without the pattern information from the stock book, it is a guessing game to determine what size shot and how much was used to create the patterns requested. My guess is that your 16 gauge was patterned with about an ounce of #7 or #8 Tatham shot at a 30" target. Your left barrel, assuming #8 shot, would be shooting about a 73 or 74 percent pattern. In a 30" circle at 30 yards, that would be maybe a modified choke. Of course we know the right barrel has no choke. Interesting stuff in your letter. Most of us don't get anywhere near that much information.
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