I'm sure there's a farmer with a hog problem that would let guys shoot for free. I know I would if I had them. I think deer are bad enough on my crops.
At one time there were farmers and ranchers who would let people come hunt them for free, but like everything else that is free, it was disrespected and things spiraled out of control. In general, the shooter's ruined it for hunter's, those looking for targets and not game. I knew a local farmer who lost 7 cows and his herd bull in a single weekend, people spotlighting and shooting at eyes instead of identified bodies. That weekend alone killed just about all of the pig hunting in the little southeast corner of my county. The depredation hunting fell to the families of these farmer's and rancher's and people they knew and trusted, we couldn't keep up with the population explosion afterwards. Those that shot the biggest pig they could find, opened the door for the smaller boars to expand their territory, sounders had new properties to destroy or redestroy, vicious cycle that is slowly turning going to the pigs favor, these people are getting older, dying off, families selling farms and ranches and creating micro-enviroments for the pigs. Barbwire fences don't stop them, unless it's v-mesh bull wire, they are coming thru or under.