I have shot a lot of big boars and 375 pounds is my best so far. If you truly want a big boar night hunting is your best option. The big ones like to move between midnight and 3 in the morning. You can either hunt with dogs or night vision. check out www.bc-coastaloutfitters.com
they put me on my 375 pound boar with night vision. There is a picture of my boar on the front page of their website. If anyone can get you a shot at a big one in the wild its these guys. I would also look at Spartan hunting lodge for a eurasion boar. I have not been there yet but plan to go soon. It is in Tennessee.