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I am trying to find out what is the minimum caliber and firearm type (pistol/rifle/barrel length) and ammunition type that is effective for dispatching feral hogs?

I know the usual suspects with the usual caveats are probably:

.22 LR/16" Rifle-shot placement
.22 WMR/16" Rifle-shot placement
.223/5.56/16" Rifle-potential overpenetration

My situation is that I am trying to shoot them at a range of 25 yds or less, 50 would be maximum but not likely. I am worried about overpenetration due to neighbors on adjacent property. They aren't in immediate line of fire but I just want to keep things on my side of the fence line. I am not concerned with immediate kills as long as they die eventually would prefer if they run off and die elsewhere.

Are .22 LR or .22 WMR out of a 6" Pistol effective at 25yds?

I underlined what I have, just wondering if there is something else I need to get to fit this sweet spot of 25yds effectiveness with no overpenetration.

Any suggestions?