The green and blue were standard colors for quite awhile. If your box has the DuPont oval logo, it is post 1933. The green Kleanbore line, in the green box, was introduced in 1931. In 1939, Remington introduced the star crimp. It took until 1947 to phase in all lines. Late 1933 saw the corrugated paper shell body from Remington. I don't have much info on Peters. The 2-7/8" 28 bore was also made by WRA Co. and is shown in the 1914 and 1920 catalogs, but seems to be gone by 1928. I would think that the big companies did not like to be 'one-upped' by the others, so Remington or Peters probably adopted the longer shell during the same time frame. I do not have any Remington info on that particular size. I hope that wasn't more confusing than helpful!
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