Alot of moose are killed by .308' s which don' t give much up to 30-06' s- just 100 fps and some muzzleblast. Withthat said, a 7mm-08 is almost ballistically identical to the .308 and the .260 is very close in comparison if used with 140 gr bullets. A 6.5 mm bullet will provide better penetration than a .30 bullet to boot.

If you think using a 30-06 or a magnum will help you in the event that you gutshoot the animal, stay at home until you are sure enough of your shooting skills to go hunting.