In my apprenticeship I worked in a fert works. There a crushing hall with 2 ball mills crushing phosphate rock. The noise levels were extremely high. The company introduced and supplied the operators ear muffs. This was long ago in the days when ear muffs were just being introduced. The mill operators (old timers) refused to wear them and threw them away. They were all already deaf at any rate and said nah, the noise doesn't worry us. I scored a pair and immediately used them for fullbore shooting.
One of our ranges, 600yds, the mound was up against a steep hill. Before ear muffs, after each shoot I went home with a raging headache. I asked the old shooters if they got the same and they said, nah, never noticed it. Mind you they all stopped at the local pub on the way home and medicated.
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