.45ACP
will do a hog nicely....if you've got the right shot. I know a fellow who killed a 300# boar with a single shot to the head from his .45 using GI hardball. However, he was in a boat drifting on the Savanah River, and the hog was on the bank, close, so he had the time to line up the shot properly...from a safe seat.
I wouldn't want to meet even a 125# boar in the brush with nothing but an ACP...
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Shoot straight & make big holes, regards, Richard at
The Shottist's Center