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Just because a pair of muffs is rated Grade 4 doesn't guarantee that in every individual case they will perform at that. Sometimes the protection will be better than rated and a very small proportion...

Can be a big issue if you have full gorilla coverage there :P Having said that, I'd say that less than one male in 500 has enough hair in their concha for this to be an issue. The quality of the ear...

I'm afraid that is a big red herring. The only sound energy you need to be concerned with is air-conducted noise. Artillery is the exception to this but I'm guessing you're not playing with that..
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