You hear about 350, 400 pounds and up
That is extremely hard to reach in a true wild hog. Normally, the genes for getting that large just don't exist in wild stock. It takes breeding with domestic hogs in order to get those "super size" genes. Secondly, a wild hog will have a hard time getting enough calories to get that big. It takes alot of food to make a pig that big. That means access to farm-type grains and not having to waste energy traveling a big circuit looking for natural food.