Yeah that Hogzilla thing went all around the hunting boards for a while. Even the expert mythbusters seem baffled:

http://www.snopes.com/photos/animals/hogzilla.asp

You are right about slow cooking to the extreme though. I shot a 450 lb Russian Boar a few years back and you had to exaggerate the process to cook enough fat out of the meat to make it not turn out 'greasy.'

I'm gonna go shoot me a 175-200lb 'feeder' hog in the now infamous Jena, Louisiana with a pistol in the early fall. I think they probably bait them with corn, so hopefully it will be more like domestic swine