The first question is: survive what?. Depending on the situation, a "survival" weapon might be a snub nose revolver, 12 gauge shotgun, scoped rifle.....
For hunting smaller game, up to deer size, take a look at the Savage 24 line. Although the current newer (24F) series are pretty heavy and have a stupid crossbolt safety, you may be able to find an earlier one in decent condition. I suggest a model with the 20 gauge lower barrel as it more effective with shot and also fires sabots for larger game. The upper barrels came in 22 Long Rifle, 22 WMR and several centerfire cartridges. Visit:
www.savage24.com for additional insite.
I have a couple of Savage 24's and find them superior to the M6.