I would choose a reliable autoloading .223 for the long gun and a .357 or .44 as a handgun. I have shot everything from ptarmigan and rabbits to caribou with the .223 with no problem. FMJ does not cause much destruction on the smaller stuff. I personally think the shotgun is an overrated choice for a survival situation. Not enough range, and the ammunition is too heavy and bulky to carry much of. In a survival situation, you can shoot ducks and geese in the water with .223 FMJ. I know a guy who has lived in bush Alaska for 25 years, living off the land. He grows his own veggies and kills his own meat. He lives 8 hours by boat from the nearest neighbor. He told me he always thought the 22 LR was the best survival gun, but he changed his mind when he got his AR-15. He carrys it with him everywhere and has killed all manner of game with it, small to large.