I looked at some of the angles that appear to show him wearing something, but it's minimal so more than likely a level 3a soft plate or something of the sort. Even if it were a level 3 plate, a .30-06 would sail right through it. The only thing that can stop a .30-06 is level 4 body armor which carries a bit of heft to it and would have been clearly noticeable under his shirt.
Also, its highly improbable that the bullet ricocheted. Body armor really doesn't work that way, even with level 4 armor.
