Werewolves would depend on which Hollywood canon you follow based on the origins one would follow. Werewolf based on a mutant Alien like infection or the genetically superior breed of apex predator created by a misguided scientist or changed by an evil demonic entity. The first is especially susceptible and vulnerable to silver as the others are generally in the same. If its all the same to you, best way to kill s pack of werewolves is a Barrette sniper rifle using a silver 50cal round, head shot the Alpha first because you can't get close to them without them smelling you coming . I'd follow up and Use a silver Bowie knife to finish it off in case it maybe still alive and cut out the silver round while I'm at it.