3d...I hunt hogs like I hunt deer. Their noses are awsome.
I have a friend in Texas who owns a hog hunting ranch so I get to hunt hogs quite a bit. Hogs get real smart after they have been hunted awhile. If your going to hunt feeders just rememberthe big boys don't come out till just about dark.
As far as hog calls go I've never had any luck with them. But I have had luck with making that soft low grunt they make when a bunch of them are feeding. After you hear it a couple times it's easy to do youself.
I don't know what time of year you are going but if the weather's hot still hunt close to water. And good hog wallows are a great place to stake out. Good Luck