There is very little doubt in my mind that the caliber of this drilling is 6.5x55 Swede. Rimless caliber drillings are uncommon, but are sometimes seen. The link, above, clearly describes a rimless extractor. There is a special issue of "DER WAFFENSCHMEID" about Fred Adolph and his guns. He clearly was more a marketer of Suhl made guns and "Newton" class cartridges. It is hard for me to believe he would release a gun without having his name on it.
Mike

Last edited by Der Ami; 11/30/15 11:57 AM.