Original 50/110 rifles had a slow twist and, judging by the short ogive bullets, typical of factory rounds back in the day, the factory did not optimise the chamber and feeding for longer bullets. This is understandable given that original rifles fired light for calibre bullets at relatively high speeds. However you can get WFN bullets loaded to 2.8” LOA that feed and cycle in a levergun, if the smith knows what he’s doing.
Seems to me there were maybe two versions on the same case: .50-100 with heavier bullet, and .50-110 with lighter "express" bullet. If I'm remembering that correctly... it might also follow that the twist rate for each may have been different in original barrels.
Maybe.
-Chris
