Canned meat can be stored a few dozen years. But I guess if that was a question, you should better care for the safety and preservation of your ammo...
A balanced diet requires vegetables, cereal grains, fruits & nuts, meat / fish, and other edibles such as oil, sugar and salt. One can't survive by eating meat alone. And regarding the storage of fire-arms and ammo, it is not that difficult. If taken proper precautions while storing, Ammo can be stocked up for many decades.
i disagree with this, we are a bit off topic, but one can survive by just eating eggs, banana and walnuts, those three element provide everything that your body need, mineral, vitamins, omega3, 6 in proportion of 6:1(which is very good compared to many standard diet in the world with ratio 12:1 or more) and macronutrient in the right proportion
don't get fooled by cholesterol level in the eggs, it is a blatant bullshit, one can eat as many as he want, they are also rich in lecithin, which fight cholesterol very well, it is also known that eggs actually lower the level of ldl and rise hdl
also added salt is useless, plenty of foods contain a natural right amount of salt