Tuukka's posts raises just as many questions as it answers IMO.
The tests we were involved in were conducted "to the side of the firing point" and only registered 52 dB from an unsupresssed 7.62x51 at 450 metres.
The supposed noise from "bullet flight path" of 150 dB must be quite close to the muzzle or otherwise those people who mark targets would be as deaf as posts I'd think - and I've done enough of it, in the old days hardly anyone wore ear protection doing it, even now heaps of people don't bother and its certainly not mandated on range operating procedures.
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