Amazing isn't it James.
The .308 is as good an elk cartridge as most. Thousands upon thousands of elk have fallen to the .308 and similar cartridges. I have use a .270 and 7mm Rem mag and the dead elk never knew the differance between the two.
I recently purchased a .338 ultra mag to hunt with. Did I need it? Heck no as any of the standard cartridges I have will do everything I will ask of the .338. I just wanted one............ Actually I wanted a .338 Lapua but it costs way too much for me to shoot so the .338 ultra was the next best thing.
The bottom line is you still gotta put the bullet into the vitals regardless of what cartridge you use.