What does your dad shoot? Just go with the standard 7mm mag, load it with 140 gr partitions, shoot a lot, learn to reload shoot some more. For NS deer it may be a bit much, but you never know what you'll be after next season.
My family almost exclusively shoots 7mag, 7/10 use it and no worries about ammo, we all shoot 175 gr/58gr 4831 for 2700 fps. Even at that 350 yds is a long shot, and we always try to get closer
My family almost exclusively shoots 7mag, 7/10 use it and no worries about ammo, we all shoot 175 gr/58gr 4831 for 2700 fps. Even at that 350 yds is a long shot, and we always try to get closer