If I give up food & water, can I keep the .40?
Minimum?
Okay, assuming some cataclysm.
I could get by with a revolver and carbine in .357 if I had to.
If I could carry a little more, I'd add .22 in pistol & rifle.
It is my belief that, as long as I felt I could get along without dining on grizzly and polar bears, those would get me by.
The revolver allows me to do chores with both hands and still be armed. The .357 also speaks .38, giving a wide range of game/varmint choices. The .22 can, with a little care, keep the pot supplied with rats of various persuasions, and the occasional bird.
And inside of 150 yards, the "shootin' back" aspect is well covered.
And, if the gods are kind, perhaps I'd get to add a 30-30 to that list.
Five weapons, three of which are rifles, all of which are in dirt-common calibres.
For now, I think that's my list.