A group of cartridges were included in the Ward’s Collectibles Auction that just ended last night, described as unheadstamped US Cartridge Co .41 extra short center fire. This is a cartridge that I am not familiar with. As shown in this picture from the auction, these appear to be a .41 Colt single action short case loaded with a very short belted bullet.
I was unable to find it in my usually dependable references (Buttweiler, Suydam, Brandt, Logan), but did find it illustrated in the US Cartridge Co 1891 and 1908 catalogs, but was not in the 1881 catalog. Does anyone have any information on this cartridge/