I have a 6.5 Stw built by Rifles Inc. Finding data is frustrating at times. I have tried quite a few powders now. Ones I've used are: H50BMG, RL25, WC872, Retumbo H4831, VVN165, and IMR 7828. Waiting in the wings to try also I have US 869 and H1000.
Bullets that I've tried are 140 Amax, 129 Interbonds, 130 Accubonds, 123 Matchkings, 107 Matchkings, and 120 TTSX. I've hit 3500 with 130 gr'ers and heavy dose of 7828 also WC 872. This wears Rem brass out pretty fast and puts a strain on the Nosler brass too. Oh I forgot to mention that I participated in the Berger 140 hybrid testing this winter and occasionally bullets would not survive the 100 yd trip.
Best accuracy is found so far using 140 Amax just off the lands with WC 872. I imagine the same thing could bs accomplished with H869.
I have faith that the Nosler 130 accubonds would be the best all around HUNTING choice for trajectory and killing effect just keep getting lured back by tiny groups with the Amax. A deer I shot this year with interbond was hammered from 350 yds. You look at how much RPMs are spinning through game and it shows astounding damage. My gun has 8" twist. Pm me for actual loads if you like