Better make sure the bad guy's lawyers don't find out about that. They'd have a field day claiming that you premeditated the shooting, as made obvious by your use of hearing protection. And also that said hearing protectors prevented you from accurately assessing the situation, therefore acting recklessly.

In an emergency situation with the "fight or flight" reflex going on full bore, I seriously doubt your body will allow you to be all that sensitive to loud noises.