Understood gentlemen, but I think we need to grant Parker Bros. some jounalistic license regarding their small bore marketing campaign.
By 1914, with the cooperation of Bro. Hedderly (editor of
Western Field starting in July 1910), Parker had been aggressively promoting small bores for waterfowl for > 5 years; and declared themselves "the pioneer makers in America" of the 20 bore in the May 1916
Forest & Streamhttps://books.google.com/books?id=VN1JAAAAYAAJ&pg=PA974&lpgThey were still offering the 20 bore booklet in 1921
July 1921
Outers' Recreationhttps://books.google.com/books?id=hns7AQAAMAAJ&pg=PA86&lpg