The attacks of black bears are very few and far between...Now, if I was going out west I would not go without my .44 mag...I wouldn’t care what the rules were in Grizzly territory....
Just as a matter of interest; a Black Bear is more likely to attack you than a Grizz.
Probably has more to due with Black Bear population versus Grizz population than anything else, but that remains to be seen and documented.