.270 is a perfect Moose cartridge, Ted (Why Not?) has mentioned on here several times it's one of the most effective chamberings on Yukon Moose he's seen in use, and he's seen a few Moose go down.
I typically take moose with a 7x57 or .308, and the odd one with a .375 H&H, there wasn't a lick of difference between any of the three rounds. A .270 might even kill a tad quicker than the 7x57, .308, or .375... unless we're talking screaming 235s in the .375. It's true speed kills, but so does slow and steady, the difference I'm starting to see is "Speed kills faster." .270's in the speedy realm.