I don't really pay a lot of attention to the new calibers coming out from the ammo companies. My wife says that's not all I don't pay attention to. Anyway I managed to make it to the range today and when I'm there I pick up the brass that's been left laying. Found quite a few .45 ACP and when I was sorting brass at home I found 7 hulls that said 50 GI on them. They seem to be the same length as the 45, just larger diameter. Anyone have any info on this round.