If you're lucky enough to live in part of the country where a hog trap will bring you any measure of success, you should give some serious consideration to building or buying one as part of your survival preparations. A typical wild hog weighs around 120 pounds, most of which is solid muscle. This will produce a few week's worth of meat, as well as a source of lard and a hide which can be tanned.
Despite all the benefits that catching one will bring, the tricky part with wild hogs is catching them safely. As mentioned before, they weigh as much as a teenager and often come with a ferocious temper making capturing one by hand almost impossible to do safely. Therefore, when you're looking at a hog trap, you'll need the following features to ensure you trap it successfully:
Once you've built your trap, you'll need to spend some time preparing for your visitors. Alongside a sturdy trap, prebaiting is the single most effective way to capture a hog. Ideally, you want all the hogs in a sounder to enter your trap but this can be difficult when there are older hogs or ones that have been captured before.
Start by laying a good amount of feed, usually shelled corn or sweet potatoes, around the entrance to your trap for a week or two before you want to capture the hogs. After this time, start to lead a trail of food into the trap, propping the door open so they won't panic when they're in there. You may want to invest in an automatic feeder to help you keep the sounder, or group of hogs, coming back without having to visit the site and leaving human scent at the scene.
To use a hog trap to capture a large number of animals, place a large amount of grain on the far side of your enclosure. This will lure all the hogs in and once the big supply has gone, they will start looking for a secondary food source. This should be next to your trigger mechanism, which will become released as the hogs push each other around to get to the food. You can then go and make your selection at your own leisure.
Remember this is all about survival, so take what you need first, and also weigh up the cost of feed & food to lure the hogs against your own survival supplies.