I have shot through heavy brush and limbs many times. This is where I like the heavier bullets. From my experience, even a 165 or 180 grain bullet will not go through brush without deflection. The 200-250 grain bullets will stay right on path and put the animal down.
I can't support this. Once a bullet hits something, I don't care what size it is, it's a guessing game as to where it goes, and what it will do.