My experience is limited, as I'm just starting in the 6.5 game. I was able to get 2930 out of a 27 inch barrel, with a 143 grain ELD-X, over RL 26, out of a 6.5 creedmoor
I got this same velocity very comfortably with R#26, 140g accubond, fed 215 primer with Hornady brass 6.5 creed.
At 50g, I still had no pressure and veloctity was 3000, about a 1.5" group, 24" brux barrel.
R#26 is changing how a lot of us think about mid size cases, even in the 6.5x47 lapua with the 140's...2850 plus a tad.
