You don’t have to kill every single intruder to successfully defend yourself. If a six-round salvo of buckshot doesn’t scatter them to the wind, there’s probably more than one person can handle, and they’re either extremely determined or extremely stupid.

I used to have a collection of American Rifleman magazines going from the 1930s to 60s (sadly destroyed in a fire.)

One of the WWII issues covered military shotguns. A marine island-hopper had this to say about trench guns: “The only weapon more effective at breaking up the Japanese banzai charge is a water-cooled machine gun.”

Now that’s about as a dangerous a bunch of adversaries as anyone could ever face.