.44 mags.
I lived in Alaska during the '80's. (way back up in there) I was always told that the smallest thing one should carry for grizziies was a 30-06 with a heavy 350 grain plus load. I have killed two grizzlies (full grown) in my life, but I was using a Remington 300 Win. Mag. (bolt action 700 series) The old timers told me that sometimes a .44 Mag. might 'turn' a bear, but that only a damn fool hunted grizzly with a handgun, and that they only done it about one time...If I was forced (this is just me) to go into combat with a big grizzly bear, armed only with a handgun, it would be with that big assed Walker loaded all the way around with about 68 grains of powder (Triple Seven 3f) pushing that .457 ball. I'm sure that push come to shove, and with a little luck, I might could blow his head off. At least with all the smoke and noise and bucking, I would at least think I was doing something anyway!.. ATTENTION SUNDLES!! The .338 Win. Mag. is a fine, fine round. I have a Ruger Falling Block chambered for it...