I've called in bears. If you stand up, wave your arms, yelling and screaming, they hall AZZ.
It is however un=nerving, and if you have a novice with you, he may leave his underwear hanging in a bush.
What ever handgun you get, get something with adjustable sights with a really nice trigger. A Glock 35 in 40 S and W is a nice one.
If you are in bear country, you will see tracks. A shotgun with #4 buck will eat a bear up at close range.
Two legged varmints are what you should worry about.
I suggest that everyone find an IDPA match and shoot every month in practice for self defense.