I think the craziest part is realizing they live in the wild, I can't really imagine coming across that bad boy in the woods..
While I wholeheartedly agree with the above post, I will put in that, if a domestic hog, the likes of a Duroc goes wild and is mated to a wild porker, these types of animals will start turning up everywhere and will be quiet wild.
Pig hunting is huge here in Australia and huge pigs are caught/shot every weekend, the bigguns always being the resultant cross to domestic stock.
I have seen many 3-400lb pigs here in CA many times never 500though. There was a guy who ran a fence operation with pigs a few hours north of me with 500lbers being the norm over there, and I heard that if a guy wasn't successful in his "Can" he would take the person to where he raised the pigs to kill one.
Where?? FhL, Tejon, cache creek? Private land outside covelo? 400 pound is pushing it in my opinion, anything over 300 is a massive pig around those areas.
If your seeing 400 pounders I need to buy you a cup of coffee
Lol Google duroc pigs, they grow huge, even without added in nutrition, just thete genetics.