Over here in Florida the hogs usually hang in the thick impenetrable jungle swamps during the day resting, it is tough to get in there without dogs and move them out.
However, when it cools off near dusk especially and they come out looking for food they hang on the same trails they have been using unless they have been disturbed. Normally the trails lead from the swamp into a hardwood hammock and during the fall there is plenty of acorn mast from the oak trees as evidenced by their rootings. Getting between the deep swamps and fresh rootings is key.
I try to setup on these trails coming out of the swamp heads when they are moving out for food and call them with my FireStorm or SpitFire and SP-55 external speaker pretty loud.
Like Glenn said, when they come running they are charging hard and you best be ready if you are not in a tree because they will do some damage to someone.
I had a large 400 or so pound sow charge me after pawing and snorting at me, it happened so fast I barely had time to think what to do, but she sure knew what she wanted to do and that was get a piece of me.
I had my Winchester Model 94 with 16 inch barrel in .44MAG with 300 grain Hornady HP handloads and shot her underneath the chin straight on right before I turned and ran. After hanging out for ten or fifteen minutes I went back and unbelievably she was sprawled out on the trail? I thought maybe I might have knocked her unconscious because I could not believe she wad dead so I shot her in the head with my Browning Hi-Power 9mm 147 grain HP handload. She was dead, the .44 went right through her sternum and nailed her in the heart and lungs for an instant kill. Pure luck for me...
It was one [beeep] of a job hauling her out of there to the Jeep using the 4WD ATV. Tried to eat her but she was too old and did not taste good.