So for my third round of load development I loaded 3 rounds of H1000 87.5, 88, 88.5, and 89 grains... All had the same seating depth of 0.01 off lands. Below are the results. I believe I'll stick with 89 and start seating depth test.
300 Rum
H1000
215 M
Nosler 1x brass
230 Berger
225 yards