Gorillas are pretty strong though. I think that TV show Animal Face Off estimated them at 20 times that of a man which is very imrpessive. And in the same Animal Face Off episode the gorilla whooped the leopard pretty badly (you should have seen the beautiful chop
). Of course a grizzly is a lot different though but at same the same time a grizzly at 400 pounds hasn't had a lot of meat to eat so it might even have less experiance. A gorilla has the strength to flip a family Sudan on its back. Let us not forget the superior intelligence over the the grizzly the gorilla has.
In actuality a grizzly is a lot more vegietarion than many people think, their diet believe it or not makes up more grass than meat (over 90%!).
Furthermore the male gorillas can live a somewhat life style. According to the book "BBC Gorillas" close to 40% of gorilla deaths are caused by fights with rival males meaning that they do have quite a bit of fighting experiance, maybe even more so than a grizzly. In fact a gorilla's fighting world maybe even similar to that of a lion, fighting rival males who want control of a lion pride (or in this case gorilla troop).
If anyone has seen that show "The Most Extreme" the gorilla is pretty strong pound for pound, especially between 325-400 pounds;
http://animal.discovery.com/fansites/mostextreme/episode/episode_01.html
""""Come to grips with the strongest animals on Earth! The gorilla can lift ten times it's own body weight, but, pound for pound, the African crowned eagle carries more than a cargo plane. Meet the top ten in most extreme strength. Come to grips with the strongest animals on earth! Which animals can take down prey much bigger than themselves, or carry weights ten times heavier than their own? The strongest humans can lift about 3 times their own body weight, but the average gorilla can lift 10 times it's own body weight! And, pound for pound, the African Crowned Eagle can carry more than a cargo plane, because it can fly carrying up to 4 times it's own weight. Something that would keep a cargo plane grounded. But which animal has the Most Extreme Strength? Find out on this top ten countdown."""
Lifting 10 times your own weight (in this case 400 pound would lift 4,000 pounds) it pretty impressive! Doubt a grizzly can do that, of course a grizzly can do some amazing things too. But at same weight the gorilla seems to have the edge here.
. Imagine what gigantic beasts he could take down. Or better yet Mas Oyama 
