Elk at distances past about 600 yards, something like a .338 Lapua, 300 Norma Mag (what I chose and am having one built by Montana Rifles), 30 Nosler etc, the various SAUMs and RUMs are better choices just to have the energy out at range. 300 Win Mag, sure to about 600 yards with the right bullets, which, IMO, the Barnes are not. The Barnes solids need more velocity to expand and once you drop below about 2000 fps, they pencil and do not effectively drop elk unless you hit the heart, spine or head. Moving over to the long range hunting bullets from Hornady or Nosler is what I would suggest for longer ranges in .30 caliber. H4831SC is one of my favorite powders, but I find I get a little better SDs and more velocity in the 30 caliber magnums with a slightly slower powder and have gone to H1000.

Optics, there are a lot of really decent choices. I prefer the Burris XTRII (Veracity is decent too) line of scopes and have them on a few of my hunting and all of my precision rifles. They are rugged, reliable and have a great feature set for the price. RTZ is perfect and with the new MAD system, you can set the elevation and windage turrets how you like. If Burris did not exist, I really like the Kahles line of optics.

https://www.burrisoptics.com/m.a.d.-system