It probably won't help you any, at least not with the Enfield. Enfield chamber dimensions bear absolutely NO relationship to the dimensions of the cartridge case! The chambers are cut 0.010" longer than the case dimensions...could be more...and are in spec! The Enfield obturates at a datum point just ahead of the case rim....anything that happened ahead of that datum-point didn't concern them that much (easy extraction did), so the dimensions forward of that point are, shall we say, generous and variable-signifying nothing....distinctions without much of a difference!
Also, Lee must have a fairly large number of lawyers on staff writing their load manual! I've noticed that ALL of their "starting loads" tend to be VERY anemic compared to other loading manuals.