The thing with all the APCs other than 10mm is they really lack the penetration of the revolver calibers, and you definitely want penetration with pigs. Preferably a whole lot of it. I'd say the .45 is probably one of the worse choices out there. It's slow as hell and unless you're shooting FMJ or hardcast, you're not going to get what you need out of it to roll a 150lb porkchop.
Seen my pow pow kill many hogs for butchering with a 22lr single shot.