If the 243 were all I had and I was hungry, well I would kill a moose with one, but having never hunted one, and reading all I have about how far one can travel when hit by much bigger calibers, my shot preference would be a head shot.

I figure if I have the time to wait it out for the perfect boneless shot, then I can wait till he holds his head still enough to shoot. I would do the same on a mule deer with a 22LR, but neither would be my preferred caliber for either animal.

Personally, I cannot see my self using a 243 as a survival gun, since it would save absolutely zero weight over something much more effective, like even the 308 and ammo weight will be virtually identical as well.

I would not be roaming the woods where moose live, just carrying a 243. my reasons are just personal feelings, but if moose live there, so do their predators, and I would feel under gunned against THEM with a 243.

That's just my opinion.