Yes to all of the above. However, keep in mind that prior to the introduction of high velocity, progressive burning powder loads in the early 1920s, the longer shells didn't carry a heavier payload then could be had in the 2 3/4 inch shells, but more/better wadding, which many serious Pigeon and trap shooters believed beneficial.
As early as an 1885 Union Metallic Cartridge Co. catalog, before they even offered factory loaded shotgun shells, they offered paper NPEs in both 10- and 12-gauges in lengths from 2 5/8 inch to 3 1/4 inch. By the turn of the century 16-gauge loads could be had in the "standard" 2 9/16 inch shell or 2 3/4, 2 7/8 and 3-inch lengths. The 20-gauge loads could be had in the "standard" 2 1/2 inch shell or 2 3/4, 2 7/8 and 3-inch lengths.
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