They ain't rhinos.
Used to be a fine gent on this forum who killed oodles of big hogs using a .22 Hornet.
i often hog hunt on thousands of acres of federal property with gun restrictions. Outside of deer and elk season hunters there are restricted to the use of shotguns and small shot or rim fire rifles.
i've killed dozens of wild hogs there using .22 LR and .22 magnum rifles. Yeah, you have to pick the shots carefully.
The .22 magnum is capable of cleanly taking hogs up to 150 pounds with heart-lung shots. On larger hogs i put the bullet in the hogs ear. My shots with the .22 magnum are limited to 75 yards.
The vast majority of my hogs are killed with .50 and .54 muzzleloaders.
i killed this old boar with a .22 LR:
This hog was killed from a tree stand my .22 magnum. The hog had his head down drinking from the pond. The bullet made jello of the lungs: