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Old 06-15-2010, 10:09 PM
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Question Is the average gunshot about 150 decibels?



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So I was watching something about the world cup and the stupid plastic horns all the locals play in the streets. The reporter said they were 120 decibels compared to a gunshot of about 80. I said BS. So is a average gunshot about 150 decibels?
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Old 06-15-2010, 10:27 PM
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Wiki says between 140 and 170 DB. I'd say 150 is probably pretty close to average since only the largest magnums would be likely to reach 170. Rarely do reporters get the details right. Years back I remember seeing a chart online comparing the relative loudnesses of different cartridges. It was fascinating. Might be worth looking up, also.
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Old 06-16-2010, 10:50 PM
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.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

http://www.freehearingtest.com/hia_gunfirenoise.shtml
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Old 06-17-2010, 02:20 PM
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Any info re pistol rounds and shotgun gauges?

What decibel level damages human hearing?

This is something few gun owners think about - everyone responds with a "hell, that's the least of my worries!" - but I DO worry about shooting an intruder indoors, at the risk of my hearing.

Jim
Old 06-17-2010, 02:48 PM
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That is why everyone needs one of these:



Old 06-21-2010, 10:10 AM
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Quote:
Originally Posted by Smoothbore View Post
Any info re pistol rounds and shotgun gauges?

What decibel level damages human hearing?

This is something few gun owners think about - everyone responds with a "hell, that's the least of my worries!" - but I DO worry about shooting an intruder indoors, at the risk of my hearing.

Jim

Hearing damage beings around 90-110dd if its on an ongoing basis, when you get to 120, acute damage begins in a very short period of time. This is also the threshold of pain in the average human. A few shots wont hurt you but if you do it over and over and over (combat situation, or too much time at the range) it will hurt your hearing.

A good rule of thumb is if your ears are ringing after a loud noise it was loud enough to hurt you and you should take it easy on your ears till the ringing stops.
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Old 06-21-2010, 10:14 AM
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I think I heard that 60 dcb will disturb conversation and 80 starts making you uncomfortable. I get actual pain at 80 dcb, but it needs to be prolonged, a couple of shots doesn't do it. We just had this discussion at the house because a neighbor complained about the noise. Judging by how far away they are, they are only getting about 60 dcb, in limited bursts and only occassionally, so the complaint wasn't valid imo.
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Old 06-21-2010, 10:55 AM
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So, it seems that to be sure of avoiding hearing damage it would be smartest to keep the decibel level to below 80.

What calibers / gauges would be this quiet?

Jim
Old 06-21-2010, 11:02 AM
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it depends on the metric you use to describe the sound level. maximum noise level, definitely a gun.
Old 06-21-2010, 11:07 AM
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- typical conversation occurs at 60 dB - not loud enough to cause damage.

-A bulldozer that is idling (note that this is idling, not actively bulldozing) is loud enough at 85 dB that it can cause permanent damage after only 1 work day (8 hours).

-When listening to music on earphones at a standard volume level 5, the sound generated reaches a level of 100 dB, loud enough to cause permanent damage after just 15 minutes per day!

-A clap of thunder from a nearby storm (120 dB) or a gunshot (140-190 dB, depending on weapon), can both cause immediate damage.

Decibel Exposure Time Guidelines

Accepted standards for recommended permissible exposure time for continuous time weighted average noise, according to NIOSH and CDC, 2002. For every 3 dBs over 85dB, the permissible exposure time before possible damage can occur is cut in half.

Continuous dB
Permissible Exposure Time

85 db = 8 hours
88 dB = 4 hours
91 db = 2 hours
94 db = 1 hour
97 db = 30 minutes
100 db = 15 minutes
103 db = 7.5 minutes
106 dB = 3.75 min (< 4min)
109 dB = 1.875 min (< 2min)
112 dB = .9375 min (~1 min)
115 dB = .46875 min (~30 sec)


(source: http://www.dangerousdecibels.org/hearingloss.cfm)

additional info:

http://www.e-a-r.com/pdf/hearingcons/FAQshooting.pdf
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Old 06-21-2010, 09:24 PM
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Space shuttle launch with Solid Rocket Boosters = 165 db. It's so loud that millions of gallons of water are dumped into the launch pad exhaust tunnels to absorb noise as the noise will destroy the orbiter on the pad!
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Old 06-22-2010, 01:17 PM
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So, with these rifles that are showing in the neighborhood of 150 decibels: you better figure that one shot, fired indoors without hearing protection, will cause permanent hearing loss: if not permanent deafness!

Does anyone know the db level of the .32 Smith and Wesson long, .32 ACP,
.380, .38 Special target wadcutter?

Jim
Old 06-22-2010, 05:33 PM
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Table 3. CENTERFIRE PISTOL DATA
.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
Old 06-22-2010, 06:52 PM
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Quote:
Originally Posted by mattjargon View Post
Table 3. CENTERFIRE PISTOL DATA
.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
I'm not so sure about these charts! .25 ACP louder than .45 Colt? And both of these about as loud as the 7mm Magnum?

Jim
Old 06-22-2010, 08:37 PM
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Quote:
Originally Posted by Smoothbore View Post
I'm not so sure about these charts! .25 ACP louder than .45 Colt? And both of these about as loud as the 7mm Magnum?

Jim
Your ears can't detect that slight .3 DB difference. It probably has to do with the pressure level of the cartridge and the length of the barrel.

That shows the 7mm mag as nearly twice as loud. The two charts may have come from different sources though, using different SPL meters and testing criteria.
Old 06-23-2010, 09:52 AM
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How is 157.5 nearly twice as loud as 155.0?

Jim
Old 06-23-2010, 12:53 PM
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Quote:
Originally Posted by Smoothbore View Post
How is 157.5 nearly twice as loud as 155.0?

Jim
3 decibels is a doubling of volume, so 2.5 is "quite a bit louder", though not quite double.

I admit that the ratings still put them pretty close together in volume, and from my own experience, there's a LOT more difference than that. But our ears don't hear in a linear fashion, so maybe the meter is right and my ears are wrong.
Old 06-23-2010, 03:26 PM
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Both charts from same source.
Old 06-23-2010, 05:07 PM
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Quote:
Originally Posted by MikeK View Post
3 decibels is a doubling of volume, so 2.5 is "quite a bit louder", though not quite double.
Wow!

OK, I gotcha: it's like the Richter scale for earthquakes.

Jim
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