Do not deliberately shoot through a lot of brush. Every bullet made will deflect upon contact, some more than others, and the deflection is entirely unpredictable.
I would recommend that you go with a 180 grain bullet in the .30-06. I have had bad experiences with 150 grain bullets when the shots were close (say 20 yards). The 180 grain core-lok plowed through the deer whereas the 150 grain powerpoint exploded on impact with the shoulder and failed to penetrate the vitals in masse (shrapnel killed the deer and it was a lousy blood trail).
The 180 grain bullets perform well from the end of the muzzle out to 200 yards or so (and even further). For deer at reasonable ranges, any bullet type will work well...find the one that shoots the best in your rifle.