There seems to be some difference of opinion regarding how tough a moose is vs an Elk.
I have been privileged to live long enough in this fair land to take a good sized number of both species, and both ###es of those species.
As one poster already stated, a shot through the lungs brings them down in fairly short order. The entry hole size is not as important as the location of that hole.
I do not believe for one second that any Elk would survive a double lung shot with an expanding bullet of any diameter that did it's job.
No expansion, or FMJ bullet....maybe, but a big maybe, even then.
I have shot more Moose than Elk. The numbers do not matter, but well into double digits in both cases.
My personal experience leads me to believe that Elk usually go a bit farther after a lethal shot than do Moose.
Regardless, it is almost always less than 100 yards with good shot placement.
I had a 6x6 Bull Elk make it 85 yards after being whacked through both lungs with a 300 Win Mag. Another, smaller bull went 60 yards after a similar shot with a 30-06.
Even a cow Elk I shot from about 75 yards, directly broadside through both lungs, made an 80 yard dash before collapsing. [308 Norma Mag, 180 Partition, bullet recovered]
Moose seem to not figure out that they are dead, and will often stand around for 20-30 seconds after a shot through the boiler room, then try to move off and just keel over.
The only moose I ever had trouble with was my fault. [first shot a bit too far back]
It was a good sized cow, and she made it about 200 yards before she called it quits.
A better shot with my '06 would have had better results, I am certain.
I shot one moose with my 6mm Remington and the 100 Partition...DRT.
Another with the 257 Bob and the 120 partition, also DRT
I have shot 8 moose with the 7x57, none required a second shot.
3 or 4 with the 6.5x55 and 140 Partitions, none went 30 feet.
Sure, I'm opinionated. But, I base my opinions in this case on solid experience.
As I said before, the 25-06 will do the job. Just put a good bullet in the right place!
Regards, Eagleye.