Beyond the explicitly pistol-centric i've never witnessed any of the experts recommending carrying a pistol for bear-backup. If it were the choice between a pistol or nothing, absolutely. Other than this, it's rifles - .45-70 (loaded with something much hotter than the anemic factory ammo); .450 Marlin; .375 H&H; some even carry a .416 Rigby or .404 Jeffrey. And spray - both, if you want to be really prepared. While those who trust in tea leaves and entrails, the wisdom of their vac-trucking neighbor perhaps as ultimate conduits of truth insist it is "just seasoning" or some similar wise-crackery, the actual scientists who have rigorously studied the stuff have revealed effectiveness on grizzlies in real case scenarios of over 90%. With far less practice required nor specialist training than a firearm demands.
There's a passage in the legendary John Hunter's book "Hunter" detailing his life as a white hunter in Africa of the early 20th when and where stopping huge, tough, homicidal animals was a regular necessity where Hunter describes handguns (always in the hands of Americans in his experience) as "interesting toys." Some truth there along with the hyperbole, as compared to longarms. I know when i ran a trapline i would have benefitted from one, with so much else to haul around. Also, despite how much of it i did, clubbing something to death was never something i was fond nor proud of. There's also the matter where if i'm being tasked with potentially stopping something as large and tough as a grizzly (which i am indeed potentially tasked with, April-December) i'm not so keen on practicing with a weapon of that of umph that weighs less than nine pounds, let alone one that can be held in one hand. I'd much rather a tin of fresh spray in that case.