260 remington v.s. 6.5x55

[CV32]

I know nothing about either cartridge, I have a daughter that wants to start hunting. Which would you choose between the two. It would be for deer
How would they perform on moose?

Here is our moose (myself and gpracer) from this year, taken with my 6.5x55mm Remington 700 Classic and a 140 gr Barnes XLC bullet.

http://www.canadiangunnutz.com/forum/showthread.php?t=192702