If you want ELR in a long action there is far more power available for unmodified long actions, specifically, the 28 nosler comes to mind. I built one off a Savage long action, used CDI bottom metal. Not loading mine terribly long or using a custom reamer and I get 3100fps out of the Berger 195s - that'll get you ELR.
Sure, you can get out to 2k yards on less power, but it's WAY harder to do. Even if you're an excellent wind reader, a lot of environmental factors can change during TOF that will cause a miss on a lower bc, slower bullet at ELR distances.
Trust me, you want more power if you're serious about ELR.