I,m also working on PP4000mr with WLRM primers Win case Speer 145gr bullets at 2895 FPS Accuracy so so, I add a little
more powder. I have RL26 at 2882 FPS with the Speer 145 gr Bullets WLRM primer Win case. PP400MR using 154 gr Interbond
2698 FPS only 2 shots Lab Radar Quit. Hunter using 140gr Partition Starline case WLRM primer I got 2904 FPS SD of 5.6 of all.
Best I got from Superformnce was 2697 FPS using 139gr Hornady, WLR primer and Starline case. I,ll try one more time and give up
on Superformnce. Worked great in my 270 win and my 30/06.