Well, my primary cartridge is the 7x57 (shock, huh?). My backup cartridge is the 7x57 in another rife with maybe a different bullet weight. And even though the bench goes deep, all the team members wear the same number. I guess that doesn't count then, does it?
I do, though, have both a .260 Remington and a .444 Marlin in the safe, but they're way in the back and haven't been shot in years.