Hearing loss from high-db impacts is cumulative. Unless it's as loud as, say, a naval 5" gun, no one live-fire encounter should create more than a short-term problem.
It's the accumulation of small damages over years of range-practice and plinking without the use of "hear-guards", which made me deaf in the middle of the human speech-frequencies. (They didn't have commonly-available "hear-guards" in the 1940s-1950s.)
Okay? Huh?
, Art