That sounds like a combination ripe for a great article on subsistence-living. Couple LEE Loaders, couple pounds of powder, couple moulds,....
I only have one "loose" barrel, which an unfired, 20" 357 Max, for some day, if I ever get time to hunt deer again, otherwise, the 357 Mag gets 99% of the attention. The 30/30 is that "inextinguishable ember of hope," that I may even have a chance to hunt out of state again, plus it's fun to shoot and assures not all my eggs are in one (357) basket. The 223 is obligatory, the only thing I still use jacketed in and doesn't get used much at all. I almost resent that one - an action tied up for what I consider a mandatory round for anyone and everyone. Great cartridge - I just like others better.
Four barrels, three actions. Sure, they're quick and easy to swap barrels, but that convenience only benefits one based on at least SOME level of prior planning and premeditation. Having ore than one action is like having one (or more) complete spare parts kits you can simply swap, in total, if one develops a limp.
I have no desire to own a bunch of barrels, though I know many derive great pleasure from that. I'd pounce on another action if it came aloing cheaply enough, and I'd surely not be saddened by the addition of a 38-55 (or 375) barrel, mostly for fun, with a noticable tint of practicality, but it's not "necessary" and I could live without it. Sure would be an easy way to get into one of the old BP cartridges, and in a platform I have come to respect and appreciate a great deal.