If you are using "energy" -- a figure derived at by calculator and not measurable -- to rate lethality, you are using a very poor measure. You're not entirely correct about handguns not being used or allowed in Africa. Depends on the country. An acquaintance just killed a bull elephant (40 pounder, I believe) with a contender in .450 Marlin. Surely he didn't have enough energy. Plenty of folks hunt with handguns only -- you are just oblivious of these hunters. I guess it takes one to know one.
What's your point? If you want to believe there are plenty of folks hunting bears in Alaska with a pistol and no rifle backup be my guest. If you want to hunt bears with only a pistol be my guest. There is a difference between 'hunting with a handgun' and 'hunting bears with a handgun', which was the point of the thread. Same for Africa ... I wager there was someone nearby with a rifle, but if not you're welcome to do that too. If you want to believe max handgun cartriges are just as good as max rifle calibers that's fine too. But to insist everyone agree with you I think goes too far. I'm not persuaded.