your body can use. u should of course be using traps, nets, trotlines, snares, to take at least HALF of your flesh food. So 200 rds a year of .22 ammo suffices, even if you DONT sometimes score a dog, deer, hog, cow, horse, sheep, goat, etc. with the .22. Do the latter on a planned, serious basis, and 200 rds of .22 will last you 20 years.