RE: best rifle for alaska
imo, overall, 300/338, take your pick.
The marlin guide gun would be an awesome backup gun, but I think you' d fall short on some hunts with it.
I have a 7mm, imo its not probably the best all around rifle for up here. An 06 might be about perfect though.
I do think though most folks up here would recommend one of the two, 300 or 338 for the average guy hunting everything in the state.