I'm with Art as far as only using the plain .270 Win. As far as I'm concerned you can never get too much of a good thing. At a minimum if you are going after anything as large as elk use 130 grain premium bullet. I like 150 grain bullets for a one bullet does all in the .270 Win.
I've got 4 cow elk with the .270 and 150 grain Nosler Partition longest shot being 250 yards. I've since retired the rifle from elk hunting as I now have larger calibers to hunt with. I've used the 130 grain bullet to take deer and smaller out to distances I probably wouldn't have tried with any of my other rifle. The .270 in any configuration is a pretty hard caliber to beat.