In spite of your valiant attempts to conceal it; your belief that no one could possibly disagree with you unless they are ignorant and inexperienced is showing.
I know I have no hope of changing that unshakeable belief, but I'll go ahead and mention, just for the record, that I've shot full house .454 Casull, .460Mag, .500Mag, a good deal of .44Mag and I've competed with stock .45ACP and 10mm pistols.
The folks on the video were trying to replicate a claimed skill level that involved both accuracy and time. Only one made the accuracy and time, and based on the muzzle rise, he's either quite a skilled shooter or he wasn't shooting full house loads. The other five shooters were unable to achieve the goal, even though they got to start with the gun aimed at the target and the hammer cocked for the first shot. I mean, nobody called them names or anything, but it certainly wasn't great evidence to back up a claim that even dilettantes could empty a .454 Casull in 3 seconds.
As far as the bear "study" goes--I agree with you that it's not really a study. I would also say that there's a lot that can be criticized about it. But there's no denying that it does demonstrate that 10mm and .45ACP are adequate to stop bear attacks, and to show further that they don't fail at the task very often at all.
