General stats show that 99 out of 100 blackies will run from a person. Problem is you may be the unlucky one that meets that 1 out of 100 the very first time you see one. Like most have said the 45 acp would not be my first choice to defend myself against a charging black bear. FBI has proven that a person within 21' and average can be on you before you can draw a holstered sidearm and fire. And a bear is a lot faster than a human.