I have a Neidner Mauser in what I call .25 Roberts. Although the barrel is not marked for the caliber, the rifle came with a wooden shipping crate with Ned Roberts name and address on it. Also came with a set of custom RCBS dies and chamber cast that the dies were made from. The cartridge is based on the 7x57 case, but has more body taper and shallower shoulder. I'll try to get some pictures posted of the cartridge.

John