Jeff, actually what I was saying was to try to make both rifles' headspace identical. Essentially your stated "plan B". Then load your bullets short enough for the shorter throat, and then you have ammo interchangeability.

An even better idea, if you're considering picking up an action wrench and a barrel nut wrench, is to pick up a chamber "go" gauge as well and reset both rifles to minimum headspace, using a real gauge instead of a spent case. Then both would be the same, and brass stretch would be minimal.

The action wrench and nut wrench are a good investment if you plan to tinker with Savages, as is the headspace GO gauge. Be forewarned though, once you learn to swap barrels, Pandora's box has been opened, and there's no turning back....