The vast majority of stuff you hear from guys in "camps" is total and absolute BS, from people that are either drunk or desperately trying (for manliness purposes) to justify the caliber they use. That is why I gave up on hunting clubs and camps years ago, and go it alone. I've got better things to do than to listen to idiots talk during my time off.
The .308 is totally fine on Elk, provided you use a premium bullet (preferably 180 grains) and keep your range to 250 yards or less. 300 yards may be pressing it.
Is the regular .30-06 good enough for Elk. Yes, no question. Well then, duh, if you buy one of the High Energy rounds or Light Magnum rounds in .308, which gives you virtually identical ballistics to the .30-06, then how is it that the .308 isn't good enough?
And, for about the first 30 years of the 20th century, the .300 Savage was regarded as a great Elk cartridge. It is about 10% LESS powerful than the .308. So
how is it that the .308 is no good on Elk.
Ballistics charts don't lie.
Mannyrock