I have been hunting elk and guiding hunters for most of my life, and I am getting to be an old man. Funny thing is that in all the years I have hunted and guided, I have never seen an elk shot with a 264 Mag.
I have seen them killed with 6.5X55, 6.5-06 and 260 Remingtons. What I can tell you is that all 3 of the above shells mentioned work fine if the bullets hold together.
But driving a bullet faster can make it come apart a lot worse, so my best guess would be to use a bullet of 140 or heavier, and get a Nosler Partition, Swift A-frame, any bonded or any expanding solid, and you'll be fine.
Stay away from any bullet that weights less then 60% of it's unfired weight when it stops.
The 264s I have seen used were all used against mule deer, and I can tell you that they were accurate and had a LOT of range, so I am sure you'll be fine using one on elk, as long as you shoot "elk bullets", not target bullets or any bullet that comes apart and completely sheds it's jacket.
Interesting...
How'd you get to 60%?
