Not that you need it, but count me as giving another vote for the 6.5 x 55 Swede.

After personally helping to skin and butcher at least 25 moose killed with this calibre, and I had to raise my opinion of it. It is certainly not the minimum moose calibre, but you can "see it from here" -- I would not like to go much smaller (and with the mild recoil of a 130gr bullet in the Swede, you really do not HAVE to go smaller).

Cheers from Sweden,

John