Grizzlies are faster than many can comprehend until you see it first hand. I accepted a long time ago that if the bear wants you it has you. Not much is going to stop it.
The one thing you have on your side is keeping a cool head.
Accepting their presence in my everyday life has perhaps given...
Two occasions of physical contact
1. Grizzly sniffed my stomach through the wall of my tent in Glacier Natl Park.
2. Grizzly slowly approached myself and a companion in the Yellowstone backcountry. It sniffed her wrist and rubbed against my legs before walking away.
Too close for comfort...
I’ve had about a dozen too close for comfort grizzly encounters. In 2 of them the bears made physical contact with me. None of them were “life threatening”.
Attacks and maulings are the exception, not the norm.
Don't overreact
I use 200gr Eld-X in 300 Win Mag
Review of the 143gr
http://panhandleprecision.com/hornady-143-grain-eld-x-review-hunting-performance-test/
https://www.ballisticstudies.com/Knowledgebase/Wound+Database/.30+cal+-+Hornady+ELD-X.html
The 2018 is a 1-8 twist. I would be looking at heaver, high BC bullets like 212gr ELD-X, 210 VLD Hunting, 215gr & 230gr Berger Hybrid's, 210gr AccuBond LR