I guess I really need to move. I go out and try to encounter a black bear or cougar and never have one coming after me! I do get a kick out of all the talk about how ineffective bear spray is when it's statistically much more effective when it comes to reducing the occurrence and severity of attacks.
I always carry a handgun of some kind, but not for protection. A handgun is my primary weapon while hiking in to my spot with the rifle (or specialty pistol) stuffed in a pack. I've carried Glock 20s and 29s, Kimber Eclipse, Dan Wesson CCBT and Razorback and an EAA Witness in 10mm, so I'm well aware of what's out there and what the 10mm is capable of. I'd say a 10mm is entry level at best as a hunting round, and I say that as a big fan of the 10mm. Out side of hunting season I currently carry a GP 100 in 10mm Mag (rechambered) and I love it for small targets of opportunity and against dogs. During modern firearm season though I'd take a 44 mag or larger all day every day and twice on Tuesday over the 10mm. For the last few years I've really like the 480 Ruger since a wrist injury limited what I can shoot. The only semi auto I'd consider "powerful" would be one of the 45 Win Mags or larger. I've packed revolvers ranging from 41 Mag up through 500 S&W as primary guns during hunting season as well as LAR Grizzly, Wildey, Desert Eagle and Automag semi autos ranging from 44 Mag, 44 Auto Mag, 45 Win Mag, 475 Wildey and 50 AE. The largest rounds in a semi auto are still pretty mild compared to what's available in a revolver.