I think a great SHTF gun is the little over and under .410, .22 survival rifles. So many load options. 45 LC, birdshot, buckshot, slugs and of course .22. They aren’t big, recoil is manageable. I wouldn’t call it my battle rifle but in the hands of someone small huddled in a closet or safe room it’s not a bad option for a close range last ditch effort to survive, not to mention its usefulness on small game.