Gary D, CJF,
5.6x35R is just the metric designation for 22 WCF, and when "hot loaded" with nitro powder( although less so than the 22 Hornet)the Germans called it 5.6x35R Vierling. Yes, the rim of 22 Hornet was thickened to prevent chambering in 22 WCF rifles, when the Hornet was introduced commercially. The metric designation of the Hornet is 5.6x36R Hornet. There is an article in one of the "WAIDMANNSHEILs", published by the German Gun Collectors Assn., about the relationship between 22 WCF/5.6x35 Vierling/and 22Hornet. A copy would be obtainable from them.
Mike