The seller finally found the ammo. In addition to 50 rifle cases, he gave me 25 or 30 2.5 inch 16GA shells loaded with black powder. The cases measure almost exactly 55mm long; otherwise they are the dimensions of the .43 Mauser, the 11.15X60 cartridge. Below are a few photos of the cartridges. He did a chamber cast, then made the ammo from 8mm Remington Magnum brass. The cases were shortened and the belts turned off, then a layer of sheet brass was silver soldered on for rims. The cases were turned to dimension in a lathe. Finally .43 Mauser dies were used to load the cases. The powder charge was a case almost full of black powder, compressed by the bullet. I haven't fired it yet, but he showed me a very small group he fired with it.