Oddly enough, that Tavor -is- legal and available in Canada. However, the 5.56mm round it fires would do little more (in the immediate term) than annoy a Grizz or Kodiak. The bear might die in three days, but meanwhile he'd still turn you into lunch.
Basically, any rifle caliber which doesn't start with a "3" or handgun caliber which doesn't start with a "4" is going to be woefully inadequate, and the .308/.30-06/300WM class of rounds don't really cut it either. Maybe for -killing- a bear, from ambush or a stalking position, but not for -stopping- a Grizz that's been startled or sees you as a threat to his munchies and comes boiling out of the brush at 10 feet. Double rifles were popular with Alaskan guides for awhile, because nothing says "Down, boy!" like .500 Nitro Express.
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