Bert,
Will be buying a Marline 1895 Guide rifle in .45/70 for Elk hunting this year....which will complement my Ruger Bolt M-77 in .338 Winchester Magnum.
For Grizzly Bears....my thoughts were simple....one loads some buckshot rounds then some slugs...then some more buckshot in the 12 Gauge Magnum. That way you can peel off his nose...put out his eyes....knock out his teeth...skin his ears....with the buckshot....if you do not kill him with the slugs. I reckon that way...if he can not see you ...smell you...or hear you....and can only gum you....you might have a chance of survival. That and with the way my knees and hands will be shaking.....I would not hit squat with the hand gun anyway....but have a good chance with the shotgun and buckshot.