Compare the results for, say, .22 against .357mag. Both have a %fatal of 34%. So does that mean a .22 is as good as a .357mag? Well, if you look at the stat for "# of rounds until incapacitation", you'll see that the lowly .22 is even better than the .357mag (1.38 vs. 1.7).
That supports the theory of other factors having more influence fairly well. The only calibers with more than two rounds to incapacitation are typical semi auto calibers.
Even if it's a magic 10mm handgun.
I do not think people prefer it because itīs magic. Probably itīs only a little beyond most peopleīs abilities and offers enough capacity to have some ammo left, when the bear is close enough for canīt miss shots.