The account in that link, from august 2002 on the Russian River in Alaska, is not entirely accurate. Yes, a ruger P89 9mm pistol was used, in addition to a SKS. The 9mm rounds didn't hit vital organs, it shattered the bears shoulder, dropping it. I forget how many rounds they said the SKS was fired at the bear.
The encounter started when one of the three men was surprised by the bear that came up behind him as he was fishing. He had a shotgun, but he could not recall if he had chambered a shell, and not wanting to hear that loud CLICK instead of a Boom, he threw the shotgun at the bear, yelled, and dove under water. His two friends, hearing the yell, turned and only saw the bear, so they opened fire.
I grew up around those three guys, knew them from church.