I am a bit of a skeptic here. The rimless cartridge was thought a vast advance for bolt actions, permitting larger magazine capacity and smoother feeding. Laboriously turning the clock back by altering a rimless bolt gun for a rimmed load seems basically a stunt, even though it can result, as here, in stunningly attractive results. And of course it has been done all along, Oberndorf made slant magazine 98 actions which Rigby used for the .400-.350 and Frazer, I believe, for the .303. The difficulties of adapting a rimless action for a rimmed cartridge were clear enough so that Howe and Whelen invented their own .400 and .35 on the '06 case rather than adapt the 1903 for the .405WCF and .35WCF. And as for making a bolt .30-40, surely Mr. Ferguson has heard of the Krag !!