According to the NRA:
"Gunshot decibel levels, measured by John S. Odess, M.D., ranged between 143.5 from a .22 short to 174.4 from a .458 Win. Mag (American Rifleman, "Hear No Evil," March, 1996)."
Subsonic "gallery" rounds can be as low as 90 decibels, but the average is 133 for all calibers as measured at certifiedreloader dotcom.
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One decibel (dB) is equal to one tenth of a bel (B).
No. A decibel is one tenth of a bel. The decibel is a logarithmic unit of measurement that expresses the magnitude of a physical quantity relative to a specified reference level. It is a dimensionless unit, because it expresses a ratio of two quantities with the same unit.
Southwell, decibel, and parallel are three good examples.
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The decibel level for standard human voices is around 60 decibels, which is also the level for singing birds. Hearing loss occurs at around 110 decibels with painful hearing loss occurring at 130 decibels.