A desperate attempt to sell some new guns during the Great Depression. Nobody seemed to push it more than Lou Smith of Ithaca.
Quote:
The 20 gauge loads have a small round sticker on the crimp with the shell length and shot size on it.
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That is not the shell length it is the drams equivalent of the load of progressive burning smokeless powder in the shell. Same as would have been on the top wad of a roll crimp shell.
ARROW 20-gauge, 2 1-2 inch 06.jpg
This insert is in a box of Western Super-X 10-gauge shells if immediately post WW-II era.
Super-X 10-gauge blue & yellow box insert.jpeg