I went back thru some of my old catalogues, and I don't find UMC offering brass shotgun shells any smaller then 28-gauge up thru the 1923 catalogue. In the 1926 Remington-UMC ammo catalogue they do offer a 2-inch brass .410-bore primed empty. My Winchester paper is pretty sparse thru the time frame, but I don't have anythng from the big W that shows a brass .410-bore shell. That loaded brass .410-bore shell may have been a U.S. Cartridge Co. and Montgomery Ward exclusive. The only brass .410-bore shotgun shell I have in my collection is a U.S. It has a baige over-shot wad stamped 6C.
My 1926 E.K. Tryon catalogue lists paper .410 Gauge (12 M/M) shells from Winchester and Remington-UMC loaded with 5/6 dram equiv. and 3/10 ounce of shot in 2-inch and 3/8 ounce of shot in 2 1/2 inch case. There is a heavy stock U.S. Cartridge Co. page in that catalogue but it only shows their three grades of shotgun shells -- Ajax Heavies (progressive burning powder), Climax (dense smokeless powder), and Defiance (bulk smokeless powder) -- in 12-, 16-, and 20-gauges.
In my 1929 Stoegers, at the bottom right corner of page 53, I find the U.S. 2-inch all brass .410 12 m/m loaded with 4-5-6-7 1/2-9 for $30.50 per 1000. However, just like the older UMC and Remington listings there is no mention of how much shot is in the loads. On page 54 the only Western .410 offered is a 2 1/2 inch Super-X with 3/8 ounce of shot. On page 55 Winchester .410 gauge Shells (Repeater) are listed as 2-inch with 3/10 ounce of shot and 2 1/2 inch with 3/8 ounce of shot.
By the 1932 Stoegers on the U.S. Shotgun Shells page the only .410 12 m/m shells offered are paper in 2-inch Climax and 2 1/2 inch Climax Heavies.
