Sound advice from a fellow British Columbian! While I do on occasion shoot wildlife, the shortest focal length lens I have ever used to photograph bears is my 600mm F4 ED Nikkor; most of the time, though, I resort to a 2x teleconverter for either the 400mm or the 600mm (i.e. 800mm and 1200mm). Bears - especially grizzlies - are not to be trifled with; they can out-accelerate a race horse (don't be fooled by their ungainly appearance!). If you choose to go ahead and attempt to photograph least bring a cannister of bear spray and know how to use it