I find it very hard to believe that there will be much "living off the land" in a SHTF environment. I would want to have a very low profile, and crankin off a round at a rabbit would definitely draw a hungry crowd.
The American Indian was one of the most practical peoples to inhabit North America, and it is documented that these expert hunters, sometimes "starved to death" in tribal numbers, and as individuals.
Shut the utilities off in a major city, and the park deer will be killed, and eaten in a week or less. Defense and co opting I think will be what it takes for any long term survival.
Of course, just like everyone else here, it's just my opinion.