You left out 9mm with a 9mm backup. I usually carry a Steyr GB and a Kahr P9 when I carry two guns. There's always the "truck stopper" .357 Ruger in the glovebox when I'm in the car. At home, I have a literal arsenal of backup guns, the 870 Shotgun is the main armament with the MAK90 and 75rd drum in reserve. And anything in between, as needed.