Not who you asked but mine shoots 130s and 150s just fine with a ten twist. It could be a case of a finicky barrel but I doubt it is the twist. Try a different bullet and tweak the seating depth maybe?
Thanks for the info Tejano. If I recall correctly, back in 1988, I just tried one box of three different weights (150, 165, & 180) and the 180s shot the best, so I settled on those. Since then, I haven't felt the need to go smaller, but was curious if it's even possible that my rifle would shoot 150s well. Sound like, from your info, that it is, at least, a possibility. Interestingly, my DPMS 20" barreled .308 with a 1:10" twist strongly prefers 165gr-168gr bullets over anything lighter, but it's pushing them a lot slower than the 300 WM.
