Most of us cannot shoot a handgun as well as some type of smallish long gun.
If I had to pot animals to try and survive, some type of midget rifle would get my vote. The Henry Survival .22 comes to mind, as does the singe shot .22 Cricket, Chipmunk and the .22 Scout (?) These kid rifles dissassemble with one screw and would stow and pack easily, and allow easier hits if it came down to plugging squirrels and rabbits to eat.
If space were not an issue, one of the Savage Combo guns, .22/410 would work, but ammo is heavier and the guns larger. It might do in a vehicle if I didn't have to pack it.
The .17 is an interesting round, but .22lr is far more common (well, till recently!)