Do yourself a favor (and the guide) Leave the 7STW at home and step up to the 30 cal for griz, at least a 300 Win Mag, loaded with 180-200 gr Swift A-Frame bullets, I refuse to take hunters with 7mm anything even for moose, just too many bears around to be undergunned and hate the idea of having to pump multiple shots into game, should ALWAYS be one and done ....
forget the Berger Hunting/Hybrid and Hornady ELDX-M bullets, while they do work and have been used successfully on griz and moose in 30 and 338 cal, you have to have an absolute perfect shot with zero margin for error and that is just not wise on a close quarters griz hunt, guides aren't too happy to go searching for a wounded bear in the last hour of light , or anytime of the day ..... or ever