Seems like the giant grizzly bear pictures and story is doing the rounds on the internet again (much like the Hogzilla story). If you want to know the details go and have a look a Snopes page on the incident. The bear had a 29" skull and weighed in at 1200lbs.
While I was checking out that story I came across this one, which is much more interesting to me- Hogzilla's Florida cousin. This boar, taken with a single shot from .44 magnum, weighed in between 1100 and 1200 lbs and had a tusk over eight inches long. Now that's impressive.