Trapperman7,
I did a little bit of internet research for you:
PMC:
165 grain Barnes XLC
Black Hills:
Gold 168 Barnes X bullet (2,650fps/2,620 Ft. Lbs energy)
Winchester:
150grn Supreme Fail Safe
Federal:
180 grain Nosler Partition
165grain Trophy Bonded
All of the above are loaded factory ammo. Saves alot of time doing the reloading research. Any of the above ammunition will likely do the job for you. There are others but this is what I found in my ten minute search.
Best of luck to you.
Cheers,
P.S.: By the way, it is not just the weight of the bullet (the "grain") that is of concern, it is also the construction of the bullet you seek. When hunting bears, you should use a bullet of sturdy construction, as all the above selections are of this type. Other premium bullets are also available but this list is a good subset of all strongly constructed bullets available as factory loaded ammunition. (edited to add this P.S. comment) By the way, what is the weight of the bears you seek to hunt? If the bears are big, use 180-200 grain bullets of sturdy construction.