They are unbelievably smart! You can burn an area 20 times that size out in a night if not careful. Even when careful, they will figure you out and they never forget. Much more difficult than deer in my opinion.
We still use some feeders, but will likely never kill a big boar at one. Piglets are easy... sows not so much. I mean, the good eatin size is still nervous. I have also found that all sows are of the good eatin size, at least on our place.
Couple of years ago, a friend on this site shot a 300 lb sow (weighed) and she was very tasty!
BigJim