It may well come down to .22 Short/.22LR/.22WMR
.22 Short will surely be banned. .22WMR will probably be allowed. This leaves the .22LR in the lurch. Though, they will probably remain. This is because the vast majority of .22LR shooters are using a Rifle. There are .22 Handguns, some use Shorts and others LRs. But for the most part I would be willing to bet that the vast majority of .22LR purchases are for Rifles and not handguns. I have never bought any firearms or ammo. at K-Mart, but Wal-Mart's registers ask on each order whether it is for a Rifle or Handgun. If they keep these records, they can determine the number of rifle to handgun purchases. But, my money is on the .22LR remaining and .22 Shorts being chucked. Even if .22LR is thrown out, most likely .22WMR (Magnum) will remain.