As an aside, I loaded my 338LM to just barely short of Mag length. And went elk hunting. Was fortunate enough to get an animal and when I unloaded the Mag after 1 shot, all of the tips (accubond 300gr) were deformed from the recoil. Also the seating depth was deeper than the recipe. Not sure what that would have done to a follow up shot but it was something I never considered during the load development. When I checked for functionality I simply loaded and ejected out of the mag without firing.
If you are going to retry developing a load, might consider examining if you are experiencing this issue.
Best of luck, and I get about 2850FPS with RL33 and 300 gr AB.