Richard.Howe

December 19, 2005, 06:17 AM

Interesting data from http://www.freehearingtest.com/hia_gunfirenoise.shtml

For context -- an increase of 10 dB is roughly a doubling of the sound level, since dB's are measured on a logarithmic scale.

.410 Bore 28" barrel 150dB, 26" barrel 150.25dB, 18 _" barrel 156.30dB,

20 Gauge 28" barrel 152.50dB, 22" barrel 154.75dB

12 Gauge 28" barrel 151.50dB, 26" barrel 156.10dB, 18 _" barrel 161.50dB

.223, 55GR. Commercial load 18 _" barrel 155.5dB

.243 in 22" barrel 155.9dB

.30-30 in 20" barrel 156.0dB

7mm Magnum in 20" barrel 157.5dB

.308 in 24" barrel 156.2dB

.30-06 in 24" barrel 158.5dB

.30-06 in 18 _" barrel 163.2dB

.375 — 18" barrel with muzzle brake 170 dB

.25 ACP 155.0 dB

.32 LONG 152.4 dB

.32 ACP 153.5 dB

.380 157.7 dB

9mm 159.8 dB

.38 S&W 153.5 dB

.38 Spl 156.3 dB

.357 Magnum 164.3 dB

.41 Magnum 163.2 dB

.44 Spl 155.9 dB

.45 ACP 157.0 dB

.45 COLT 154.7 dB

Not sure if I understand all this data -- like

- a 9mm is louder than a 45 ACP?

- .308 and 30-30 noise levels are virtually identical?

- 2" more barrel in a 12ga creates a drop of about 5-1/2 dB?

- a 30-'06 in an 18" bbl is as damaging to the ears as a .357 revo?

- .223 and .25ACP are about the same?

- Were these tests indoors or out, and at what distance from the firearm?

Still interesting nonetheless...definitely a reminder about the cumulative effect of all those "just this once" moments in the woods...

Merry Christmas!

Rich

For context -- an increase of 10 dB is roughly a doubling of the sound level, since dB's are measured on a logarithmic scale.

.410 Bore 28" barrel 150dB, 26" barrel 150.25dB, 18 _" barrel 156.30dB,

20 Gauge 28" barrel 152.50dB, 22" barrel 154.75dB

12 Gauge 28" barrel 151.50dB, 26" barrel 156.10dB, 18 _" barrel 161.50dB

.223, 55GR. Commercial load 18 _" barrel 155.5dB

.243 in 22" barrel 155.9dB

.30-30 in 20" barrel 156.0dB

7mm Magnum in 20" barrel 157.5dB

.308 in 24" barrel 156.2dB

.30-06 in 24" barrel 158.5dB

.30-06 in 18 _" barrel 163.2dB

.375 — 18" barrel with muzzle brake 170 dB

.25 ACP 155.0 dB

.32 LONG 152.4 dB

.32 ACP 153.5 dB

.380 157.7 dB

9mm 159.8 dB

.38 S&W 153.5 dB

.38 Spl 156.3 dB

.357 Magnum 164.3 dB

.41 Magnum 163.2 dB

.44 Spl 155.9 dB

.45 ACP 157.0 dB

.45 COLT 154.7 dB

Not sure if I understand all this data -- like

- a 9mm is louder than a 45 ACP?

- .308 and 30-30 noise levels are virtually identical?

- 2" more barrel in a 12ga creates a drop of about 5-1/2 dB?

- a 30-'06 in an 18" bbl is as damaging to the ears as a .357 revo?

- .223 and .25ACP are about the same?

- Were these tests indoors or out, and at what distance from the firearm?

Still interesting nonetheless...definitely a reminder about the cumulative effect of all those "just this once" moments in the woods...

Merry Christmas!

Rich