Glacier Nat Park of Canada, bears, and group hiking

Bear bangers, spray, and proactively making noise so as not to surprise the bear will generally keep you safe. A larger group will also be a deterrent, but as long as I had the other preparations mentioned, and a hiking partner who was also prepared to use them, I wouldn't worry much about it. In the off chance you encounter a grizzly which is particularly aggressive, it's going to be a bad day no matter what.