In 27 years of elk hunting I have never taken a shot that I could not have taken equally well with a .308 Win.
There have been MANY times, however, when I wished I was carrying a lighter rifle. Like almost every day.
That said, I do think there are better choices including a .270 Win, 7mm RM, .30-06 and .300 WM. I used a 7mm RM with 160g bullets for 20+ years without problem and my buddy has used his for 10. I've used a .30-06, .300 WM and .45-70 to take the last 4 elk. They all worked.
Choose your bullet and placement well and good things happen. These days I prefer 168g TTSX and 180g MRX for my .308W, .30-06's and .300 WM. But a Partition will do fine.