FWIW, I did a bit more checking in my old catalogues and 2 1/2 drams of bulk smokeless powder pushing 1 ounce was the heaviest 16-gauge loads in the 1903 and 1904 UMC catalogues, but by the 1905 UMC catalogue the 2 3/4 drams of bulk, or the equivalent in dense, smokeless powder pushing 1 ounce of shot had been added to the offerings in their top quality Arrow shell.
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