cold weather powder for 300 RUM
my brother-in-law is being given a top-end whitetail hunt in north canada where the ideal temp is -20 F for deer moving in Nov. another friend gave him a 300 RUM with this hunt in mind; not my recommendation but that's what i have to work with, as i reload for him. balancing all factors given the cartridge, i'm thinking i'll try 180 grain bullets as shots tend to be 150-200 yards and bucks usually 250 lbs +. if accuracy isn't satisfactory i can try 165s and 200s i have.
my question: any recommendations for a minimally temperature sensitive?
i have already told him to re-sight in when he arrives and expect a difference in POI.