Seems like a direct shot up the nose with a .44 Mag would be better, and you can do that from more than a foot away
Close friend of mine lost his wife to a bear attack up in Alaska, and he almost lost his own life. With a 44 he stopped a bear charging him, and the bear slid right up to his feet on the rocks where he was. By the time you are close enough to be sure to get a shot into the skull or the heart, you still have to get out of the way after shooting.