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Hearing damage is cumulative to exposure as well and 120db is definitely high enough that if you were exposed to that in a work environment, the health and safety authority in your company would order you to wear ear protection.
I've got damage from a 22-250 going off and suffer from tinnitus in my right ear. Doc says any more exposure in that ear will make it worse. So for me, these devices are a definite no. Bad enough being on the back of an open air cab of a fire truck and having the damn federal siren screaming - I put in ear plugs now when I get on for a call.
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