I,m using RL26 for 145gr to 169gr bullets. I got 2868FPS using Sierra 150gr Bt and RL26 . PP4000MR did 2888FPS with Speer 145gr SD of 9.6 5 shots. I have
more loaded including Superformance but have not been to range. RL26 seem to be best for the 160gr Nosler Partitions.
Wow that’s fast. What’s your barrel length?