The study I quoted is dealing with problem bears and those that might be chewing on you. For a straight through the gullet shot it may not matter if you have a 13 shot BHP with 125 gr rn or a 44 5 shot. What I believe the article set up was that if you can still draw and dump your magazine at a range that may be less than 6 feet a 9 can be effective.
That takes a real effective shooter who is cool under pressure rather than a practiced shot.