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with the really heavy stuff mouth open is good as it allows the pressure to escape. With closed mouth you can rupture shit thats supposed to stay in one piece!

Must have been some REALLY dumb shit...

Definitely inadequate hence the reversed 9mm cartridges in the ears under the muffs - but this didnt prevent noise through the skull behind the ear
Distance is always your friend in these cases.
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hahaha a literal interpretation of my request, awesome!!

Yip, 600 is cheap as chips compared to being deaf, couldn't agree more.

Coming from a bomb disposal background I can tell you that the majority of personnel have no clue of whats good and whats bad which is compounded by the govt attitude of "you will wear what we tell...