Take a shot at custom calibrated hearing.
Gunshots can create an immensely loud noise. One shot can be measured at 150dB, 65 decibels louder than what is considered to be a safe volume of noise. This can seriously affect your hearing and cause a variety of problems including tinnitus, temporary hearing loss, as well as, permanent hearing loss. Hearing protection is imperative for any shooters including military personnel, law enforcement officials, SWAT and other tactical teams. And at the same time these people need to be aware of their surroundings at all times.