If you gotta survive on whatever meat you can kill, a Ruger 10/22 rifle and/or a 9mm carbine. If you can fit it in, try to cop a shottie too. Three of the most plentiful calibers will be .12 gauge, 9mm, and .22LR. At the same time, they will also be the most sought after.
A 9mm carbine and pistol, particularly if they both take Glock 17 magazines so you can use them interchangeably would be a good starting point. I'm building a Glock 17 pistol in the next few months and I already have a KelTec Sub2000 in 9mm that uses those magazines. 9mm from a rifle can carry enough power to kill a deer with good shot placement. You could also get a cheap Glock 19 clone and just use the G17 mags with it.
A shotgun will definitely put food on the table, as they always have.
