I have used a bunch of loads in several .300 WM's, but these are the ones that stood out:
168 TSX, 72 grains of RL-22 for around 3200 fps.
180 Speer Grand Slam, 75 grains of H4841 for 3050 fps.
200 Nosler Partition, 78 grains of Magnum for 2950 fps.
All of these grouped three shots well under an inch at 100 yards, often with all shots touching or nearly so. They killed stuff, too.
For accuracy, I've had excellent results with IMR-4350 out of my 300 WM. 72grs under 180 Nosler BT's and CT/BT's.
