[Researcher]

Dean, I'd expect a 1935 vintage 28-gauge to have 2 13/16-inch chambers intended for 2 7/8-inch shells.

Remington Specification Sheet GHE 28-ga highlighted.jpg

The progressive burning smokeless powder, high velocity, 3/4-ounce, 28-gauge loads were introduced in 1931.

Super-X Loads, March 1, 1931.jpg

NID 28-ga Field & Stream April 1932.jpg