What twist rate is your barrel? Hammers need to be run at recommended twist rate or faster. 137 HH requires a 1-6.5 or faster, 131 HH require 1-7.5 or faster.
I got on it because I couldn't find rl-26 before this shortage... but rl-25 has worked fantastic in my PRC. Shooting a 140 at 3050. Didn't push her any harder just for barrel life.