I got to experience fighting within the confines of a Humvee once. M-4s in the cab and an M-2 .50 going off above my head.
I don't know the science behind auditory exclusion, but after getting back to the FOB, my ears felt fine (I had in an ear piece in one ear) but I felt like I did back in high school after getting a concussion during football.
So, my point is, if it comes to your guns, you might not even notice your ears.
NRA Life Member
Ladyfriend: "I need help with the leaves in the yard"
Me: "Controlled burn?"
LadyFriend: "I forgot my Boy Scout turned into an infantry officer."