I used to carry a Beretta 21 in the aircraft for a light survival gun. They are surprisingly accurate and easy to shoot, but safe and pocketable. I would also look at a Bersa .22 for something a hair bigger and super high quality. Or a little S&W revolver in .22. There's a lot of new junk out there.
If it wasn't going to be a smallish gun, just get a Ruger 22/45, S&W 422 or Buckmark in some configuration that makes sense. They literally shoot like rifles, which will make a lot of sense when squirrels start looking tasty.
For a centerfire, I think a .38/.357 revolver makes a certain amount of sense as a gun that can be hunted with due to the stellar accuracy and trigger pull. Good enough for defense, but light loads are appropriate for small game and magnums will work on deer.
Really, anything will work, and it wouldn't be dumb to buy a Hi-Point 9mm or Jennings .22 if it was going to be shot very little and sit in a bag all the time.
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