For me, 57.0gr of IMR 4350 and the 165gr Hornady or Speer, and probably any other 165 grain bullet, works very well. To steal the line from O'Connor - if an '06 won't shoot 57 grains of 4350 with a 165, you need an excorsist (sp), not a gunsmith.
If it won't work with a 150gr bullet, perhaps you're not using enough powder. It's been my experience (however limited) that 150's need a max load of that powder before groups start to shrink - 59 grains or so.
