So I was out the other day just driving around. I spotted some cartridge cases laying on the ground, so I stopped and picked them up. several common cases, but I found one that I have never seen before. I looked online, but I couldn't find anything that matches. I measured it, the case is 1.392" long, with a inner mouth diameter of .380", the head of the case measures .472". its really short to be a rifle round, but I can not find a rimless bottle neck case anywhere near these dimensions. at .380 i.d. that seems a bit large for a 9mm, but maybe. and its to small for a 40 cal. this isn't something that I need a definite answer on immediately. but if I can find out what it is from, maybe I can ask around to see who might own a firearm that this comes from. because frankly, I would like to shoot it!