As I posted earlier here in North America for the first three decades of the 20th Century the factory 28-gauge loads were 5/8 ounce whether put up in the 2 1/2 inch or 2 7/8 inch case.
Western Cartridge Co. introduced their Super-X, high velocity, progressive burning powder, 3/4 ounce 28-gauge load in early 1932.
Ithaca Gun Co. chambered their NID 28-gauge doubles, that reappeared in their 1932 catalogs, for this 2 7/8 inch shell,
as did Winchester when they introduced their Model 12 pump in 28-gauge in 1937. Just before WW-II our ammunition companies began offering a 3/4 ounce 28-gauge skeet load put up in a 2 3/4 inch case. Shortly after WW-II our ammunition companies did away with the 2 1/2 and 2 7/8 inch 28-gauge hulls and from then on all 28-gauge loads have been put up in 2 3/4 inch cases.
