I'm just thinking along the lines of simple survival and reliability. 95% of the game out there is fairly small: bird, squirrel, snake ...and the like. All of natures small animals come in a handy single serving size. The knockdown power of which you speak is only good for the rarer large game animals. Those would be good to feed 20 at a time. It just depends on the animal availability and number of people that you are trying to feed. A large caliber weapon will positively vaporize small game thereby cutting out the large numbers of small game out there at your disposal. A properly used .22 can still take down a deer.