If your in wolf/black bear (not grizzly) country, even a 9mm with a good bullet is sufficient. One of our guys had to shoot a black bear attacking a neighbors goat with his 9mm using 147gr Remington Golden Sabre bullets and killed the bear with a couple of shots. Not recommended in my view, but that’s what he had available and was carrying?I do when in wolf/bear area. Otherwise, it's usually 9mm DA/SA P229 Legion or P365, depending on attire and situation. On rare occasions, when clothing permits and I feel like something fancy I wear a Kimber Classic Carry Elite 45ACP 1911 but P229 is the standard choice.
Yes, then better with a 10mm.I think Polish brown bears are roughly grizzly sized but supposedly more laid back. In any case I like my odds better with a 10mm.