My two cents......and accuracy over velocity.....
In the two 6.5 PRC's I had built, H-1000 was the winner over R-26.
140 VLD's at 3100 in a 24" Bartlein.
The two 6 PRC's I had built, R-26 was the winner over H-1000.
108 ELD'M's at 3425 in a 24" Bartlein.
Sounds about right but I'm having great accuracy with it in my 6.5-284 with 143s. Getting .3 MOA at 800 meters