RE: Moose Hunt rifle selection
Where will you be moose hunting?
If you're looking for an excuse to get a new rifle/barrel, how about a .338 win mag? Not sure what all you can get chambered for the TC, but I agree, I'd take my .340wby for a moose, or maybe a .375H&H, I have a hunch that TC is probably more likely to load the .338 RUM instead of the .340wby, though they may only chamber the .338 Win. Mag.
A .300 Win Mag is certainly not a bad option, though I'd strongly consider a .300 WSM if I was thinking of the .300 Win Mag.