I asked this same question a little less than two years ago and went with the 47L. Now I have two 47Ls; both with Bartlein Heavy Palma barrels and a spare barrel for one of the guns. All 3 barrels shoot 140 Hybrids in the 2770's. All 3 barrels will shoot either 4350 or Varget, and all shoot in the .3's or better. Unless there's a lot more velocity to be gained I don't think these results can be improved upon; at least while I'm behind the gun.
I have a 20" 700 Sendero I re-barreled with 6.5 Creed and just started working up loads with the new Lapua brass so it will be fun to see what happens.