I was hesitant to reply here, but it does depend upon the gun, projectile used, distance, size of the animal and shot placement. A .357 Bulldog shot to the brain will shut a hog down within 50 yards. I haven't shot many animals with a Bulldog beyond 50 yards, so I can't comment beyond that. Now body shots on hogs are in questions in my opinion and here's why. I recently shot a large wild hog broadside behind the right shoulder with a 140 grain hollow-point boattail Griffin Airgun Ammo slug from a Bulldog M357. I shot from a kneeling position using a tall adjustable bipod as a rest from approximately 30 yards out. We were both in an open space. I caught the hog as it paused while walking across an opening. I am not the greatest shot, but there is almost no way to miss this shot. I tested the gun at various ranges to verify my DOPE the day before. It performed as it should and my target indicates that an animal is dead at that range shooting the first 4 of the 5 shots in the mag. My projectiles were not deformed before loading the mag and I shot from a full reservoir. I heard the slug hit, watched the hog go into the brush after it was shot, it didn't bolt. It stopped within the brush and appeared hurt (watching it through the branches), then walked forward a few steps further into the thicket where I didn't have an opportunity to shoot again. I was unable to recover it. I am confident that it died somewhere from at least one punctured lung, I just don't know where or when. I would like to recover the carcass to examine penetration and take photos to show the property owner, so I went looking for the hog until I ran out of light. The brush was very thick which made thermal pretty ineffective in assiting me to find it. I did not find a blood trail. I have to revisit the site to see if I can smell decay or see buzzards in the area. Personally I don't need to find the animal. I have video footage of them destroying property, I witnessed them doing it with my own eyes up close, and I have photos of the aftermath of the activity. These are bonafied pest animals and an invasive species.
For this reason I would recommend brain shots if you need the animal to drop on the spot. If none of this sounds desirable, stick to brain shots on large hogs. I believe that a small to medium sized hog would've gottern crushed by that shot. My take on it with limited expeirence. I haven't shot a lot of hogs with airguns.