Have mentioned this before, but the quickest-deadest I've seen a bull moose killed with a pure lung shot was with a .270 Winchester and a 150-grain Partition. Took a step and a half and fell dead.
Have seen a big Alaskan bull shot with a 300-grain .375 H&H at relatively close range. It fell--then got up again, requiring another shot, whereupon it fell and stayed down.
Have seen a bull shot three times through the lungs with a .300 Winchester Magnum, with bullets that made a mess of the lungs and exited. Didn't go down until several seconds after the third shot--while the hunter was stuffing more rounds into his rifle's magazine.
Good luck on finding consistent results on moose due to "caliber."
