This is why I thought that. Of course, who's to say he's right.
From the UMC section:
"Union Metallic Cartridge Co. (UMC) was originally formed to provide firearms and ammunition to the Union Army during the U.S. Civil War. UMC was reincorporated in Bridgeport, Connecticut in 1867. UMC began to sell unloaded brass shotshells in 1868, which is said to be the first commercially available shotshell in the USA. Twenty years later, in 1888, UMC began to sell loaded shotshells."
http://www.rbs0.com/shotshell.htm