From tests I've studied and my own experiments, one thing comes through: The closer the obstruction to you, the wider the ball/bullet is going to veer; and conversely, the closer it is to the target, the less it's going to veer. After that it's getting down to voodoo on what's likely to happen. I've seen long bullets, short bullet and round balls veer like crazy- enough to miss a deer completely when striking an obstruction only 10' from it- depending, I suspect, on the angle they hit the obstruction and how much of it they hit.
Rattle it all in a can and spill it in the dirt, and my view lines up nicely with the others who have responded so far: Don't hit the brush, and pass up the shot if there's a chance of doing so.