to take small game, to use subsonic
22's (thru the 223 can) to quietly remove a sentry or guard dog, to make your 223 ammo last longer, to make use of "recovered", found, or bartered-for ammo, dummy. HALF of the 6 billion rds a year made or importedinto the US each year is .22lr, and that DOES include the shotgun shells. So if you aquire ammo after shtf, the odds are that it will be .22lr, ESPECIALLY in useful amounts. finding 50 rds with the dead guys AK barely makes the package worth rolling up his poncho and burying. It's really easy, however, to have 500 rds of .22lr, and QUITE likely, actually, because of that ease, low cost, quietness, etc. MANY will switch over from shotgun, bolt centerfire, etc to .22 auto rifle, once they wise up (from seeing friend shot dead, after making NOISE, and being REALLLY unable to fight worth a hoot).