I believe that maynard rifles used something like this. Except they had a flange on the rear end of the cartridge. Ballard also used something like this as well. Since they look to be unfired could they not be some kind of a "one off" that was built as a proof of concept thing. The civil war smith and gallagher cartridges also come to mind. The gallagher had a somewhat tapered case with a wedding ring around the front and the smith I think was just a straight case, although I could be wrong here.
A buddy once had a smith replica and always griped about the smith cases he used. Would always get stuck in the chamber. We measured the chamber I.D. and the cartridge O.D. and found that the cases had a slight taper. Jury rigged a mandrel in my lathe and took off some metal, basically just a skim cut. After that no problems. So thats about the extent of my meager knowledge. Frank