I've worked up loads for several '06s with all bullet weights and the most consistently accurate powders for the 150 grainers were;
I'm pretty sure Midway still offers the Rem 150gr S.P.C.L. in 100, 500, and 1000 counts. But you might find one or more of the many other bullets on the market will shoot as good if not better than the Remington's.
If you need any more help with this, holler