I'm sure that most people will disagree with me but I feel that a .22 magnum makes the ideal(actually there are NO ideal all purpose everything rifles)survival rifle. Before yall get the noose or cross out let me explain. I hunt edible small game with a .22 mag and solid fmj bullets. I've discovered that a .22 mag fmj bullet leaves exactly wound channel as a .22lr with hollow point but with more penetration and range. For close range varmits,(up to 150 yards) the .22 mag with hollow pointed bullets do a dandy job. I've even shot deer (crop protection and culling) with the .22 mag and it drops them like a rock with head shot. The .22 mag has snake shot that is lethal on snakes within 9-12 feet also. You can carry enough .22 mag ammo to feel guilty,most firearms chambered in this cartridge are reasonably accurate,and ammo is reasonably priced. I've said my reasons that I think what makes a good survival gun,let's hear yall's.