I'd go with the WSM as you can get ammo for it if you have luggage issues. I haven't seen 338-06 on the shelf. If you can preship a supply to your guide, I'd like the heavier bullet of the '06.
Very expensive to ship ammo to AK... we do not have anything they call "ground" so it has to come by barge and the minimum weight to make it reasonable is measured in hundred pound units... It is pretty much a bring it in your baggage or buy it here proposition.
Yeah, but Alaska Airlines will let you ship 50 lbs per bag, ammunition only, if you prefer! . 3 bag limit in Alaska....
. 3 bag limit in Alaska.... 
