Try the Barnes Triple Shock. I have not been a Barnes fan, but I will tell you that I tried them in my .240 Wby and .300 Wby and the are really good with the H4831.
You will need a Barnes, Partition, Accubond, or Scirocco. I personally would use the 130 grain Accubond. I would not use ballistic tip on elk size animal uselss using a heavy magmum like .338 or so. The .270 Wby is great and the Acuubond is a great bullet for Elk.