Thanks, Garnett.  I have two 220 barrels for a newly acquired .30-30, a 28" 20 guage and a 26" .410, with forearms.  Once I get the rifle action in hand, I'll try the two barrels on it.  But I think that since they have been on other frames, it IS merely luck if they fit.  One or both will very likely need fitting.  All are Utica-made, as is the .30-30, a "-219-" model.
It isn't a big job, but you need to know what you're doing.  If they're very close to a fit, you can just use emery cloth on a file  or block to fit the barrel lugs.  If not, it takes some precision filing, which I would rather have a pro do.