I never used the 150 in competition. My favorite accuracy load was 39 gr. of IMR 3031, 168 gr. Sierra HPBT bullet #2200, LC case, just about any standard LR primer. I used that load for 20 yrs. of 200 yd. match work with iron sights with VG results.
If I remember correctly (very long time ago) the US Army Marksmanship Unit used that load as well. I believe the velocity was about 2550 fps.
