I have lots of guns, but my "survival rifle" is an old Remington model 721 chambered in 30-06. Yeah it's not a 300 win mag but a well placed shot will stop almost anything you want and take game without slaughtering it. I suggest you go to you're local gun SHOPS. Check them all out because all gun dealers are not created equal, but tell them what you are looking for and how you intend to use the rifle. Many gun shops take guns in on consignment and there are bargains to be found. If you know anyone that is a gun enthusist, take them with you and don't get pressured into buying anything. If a salesman (used loosely) recommends a gun, take down the make and model and do a little research, if nothing else ask here.

It's a serious investment work the research.