well my best deer load is using a 165 bullet (hornady sst) the load is :
165 grain sst (bullet has a good BC)
43.8 grains of IMR 4064
winchester case, cci 200 primer.
(in my gun this load is not max at all but in one book i had its over the max so please load with care)
i've only played with two 150 grain bullets.
one of them ,just for fun, was the 150 grain corlokt using surplus powder (BL-C2) and it did quite better then i thought , right at 1.25 groups at 100 yards.
but the other was the sierra 150 soft point boattail (#2125) i used IMR 3031 and VARGET . VARGET did alot better the 3031, best load i got was
150 sierra spbt
44.5 of VARGET
winchester case, cci 200 primer
with this load , in my rifle, 44.5 shot just as good as 44.8 but 44.8 started to flatten the primers so i stuck with 44.5. it shot under MOA with .75 inch group as the norm.
same bullet , case and prmier with 3031 gave me just over MOA (with a few groups smaller) i used 43.8 grains. but this load is (ruffly) 200 FPS faster (says the book i didn't have a crono for the testing) and sure did dump the two deer i took with it.
i hope this helped but just to muddy the water some more heres a pic of my favorite group shot with the hornady load.