I have the 270 and a 300 win mag. I shoot ELD-x out of both and love them. I have shot both deer and elk with them. And they shoot great out of both of my rifles. The 270 is a Tikka and the 300's (I have 3) are 2 Browning A-bolts and 1 Remmington LR700.
I would hard at the Manti Multi season elk tag. There are some great bulls and lots of them. I know if you do draw it, and dont go guided, I can point you into the right areas. But there are LOTS of good areas. Last year we saw several bulls in the 350 range or bigger. Lots of 320-330 bulls.