Read the whole thread and it is an interesting one.
Which begs the question...
Why bother hunting, tracking, stopping wounded bears with anything over 30 caliber?
OR
Is there a scenario in which the over 30 cal rifle gives the hunter or guide an advantage?
While I might be willing to hunt the large bears with a sub .30 caliber rifle, I sure wouldn't want to see one in my guides hands. I've read stories of native guides backing up bear clients with .30-30's. In that situation I'd carry a .338.