As an example, look back at when Aureo dove behind the concrete barrier. I used the barrier itself and a comparison with modern day tank armor to show how much damage the bullet was capable of, instead of saying how much damage it should cause if it hit Aureo, since the calling of that damage is up to you (though my personal estimate is that it would take two or three hits at least for a bullet to reach any sensitive parts, since his shell is quite a bit more durable than tank armor).