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You're behind a mound. You hear a crack overhead. Start counting and concentrating on determining the direction the rifle report comes from. This will tell you where the shooter is.
A silencer on a supersonic round will muffle the barrel report, but do nothing for the supersonic crack.
@freemo
That's what I gathered from the thread. Whether you wear hearing protection for the supersonic crack seems to be a judgement call. Some people wouldn't go without. Some say it's not "that loud." One source says he measured 163 dB with no suppressor, 142 dB with one... saying nothing about what kind of round or suppressor.
Personally, I'd still wear hearing protection @ 142 dB, as would most, I suspect.