You setup a large cage in the woods with one large open end. Then you place slop in the middle. Each day you bring the wall in closer and closer as you feed them more slop at the same time each day. The pigs will bring in more pigs. Until all the pigs in the woods are in the pen waiting for thier daily ration of slop.

The pigs grow use it and don't notice the only way out is getting smaller and smaller, until there's only a single path out. Then you give them one last helpings of your best slop and slam the gate close. They'll scream and yell like nothing you heard before, but all you gotta do is shoot them one by one. It's great fun with an AR10 308.

That's how you catch a wild pig.