A person could get a 308 and have the rim cut for the 307win. Rims help considerably with the extraction or ejection system on the Handi's.
Further, if cast bullets are to be used, the long neck on the 30-30 and
30-40 keep the gaschecks and the grease grooves in the neck where they belong. Oh, the dilemma for all the Handi-holics. :-)