I saw this on another forum and thought some of the answers looked interesting. If you had to survive with only 1 gun to provide food, protection, and carry your ammunition what would you choose? I picked the 223 because it is a very common cartridge and you could shoot small game with FMJ's and bigger game with the 60gr partition. I currently use a 243 for coyotes, and 7mm or 30 cal cartridges for anything bigger, but I think I could make it on a 223 if I had to. Also after reading the other post I weighed loaded rounds and it takes 2-3 223 rounds to equal the weight of 1 243 or bigger cartridge. 22's make a lot of sense too but I wanted more range and thump.