In part 1 we discussed:
The types of predominant lists
Tactic #1 Psychic defense against grey knights
Tactic #2 Removing their psychic protection
Tactic #3 Reducing the amount of power weapons before assaulting
In part 2 we will discuss.......
Tactic #4 DON'T BE TIMID! Space Wolves are meant to assault. Be smart but don't be intimidated by grey knights. That being said, of course they have power weapons. But they are also weapon skill 4 and have less attacks than the space wolf grey hunter. If you are fighting strike squads, shoot and assault as you have the advantage. If you are fighting purifiers then you have to be more careful. Since they are fearless and have 2 base attacks they are a tougher nut to crack. If you play MSU, it might take multiple units to take them down. Be smart about your situation.
I.E. You have a 7 man GH unit with a meltagun and combimelta powerfist with going against a 10 man strike squad with 1 halberd and 2 psycannons. Shooting into the the unit will kill 1-3 models.