Sorry, not a lot of help but I ran them in my 300 WM with H1000. Shot well, but I decided to move on to 181 hunter hammers because it has the same BC shooting 150-200 FPS faster.
Took 2 quick tests with 4831sc, 79.0 and 80.0 grains. The LRX were seated such that you can just see the entire first (uppermost) band. the 80gr showed promise. Going to keep playing up to 82 or 83gr to watch for pressure signs. may also play with up to 83gr of RL-26. Next time i'll take a chrono. Recoil in the mark v ultralight is significant at just under 8 lbs and no brake.