Loudest for HD indoor?

Discussion in 'General Firearms Forum' started by Eric2340, Aug 12, 2020.

  1. Eric2340

    Eric2340 Infidel :)

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    What say ye -

    What do you think is louder to light off (God forbid) indoors in a HD situation?

    16" AR or a 18" 12ga?

    That said, that BOTH I am sure are going to be louder than a .45 / G21 fired under the same circumstances?


    Just rethinking my whole HD plan for what is best for all in the hose (myself and two others on the OPPOSITE side of the house in the middle of the night)? Not enough time or ability to distribute earmuffs to all when something goes bump in the night. :(


    Thanks -

    Eric
     
  2. H&K .45 AUTO

    H&K .45 AUTO Gunslinger

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    People really overthink this. Here are a few things to consider:

    * ANY firearm being discharged indoors is going to be painfully loud without a suppressor.

    * Something known as AUDITORY EXCLUSION occurs when a person is in the fight or flight mode. As such, the sound of gunfire is not likely to even register with you in a life or death encounter.

    * Your proficiency with the particular firearm is far more important than worrying about which one might leave you 70% deaf vs the one that will leave you 56% deaf.

    * Even if you are wearing ear protection, the rest of your family members likely aren’t.
     
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  3. gamecocks

    gamecocks

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    Totally my guess, but I'd suspect the AR would be louder than the 12g. Both would be stupid loud indoors without protection. Yes, I also think both would be a good bit louder than a .45 Glock.
     
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  4. Eric2340

    Eric2340 Infidel :)

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    Thank you, I appreciate the answer.
     
  5. collim1

    collim1

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    I have accidentally touched off a round without ear pro on a couple of times. A 12g is most definitively easier on the ears than an AR15 carbine.

    I can only imagine the AR15 would be louder indoors.

    In the unlikely event of a home invasion my last concern is my ears. If you really want to put a set of muffs next to the gun and toss them on.
     
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  6. Eric2340

    Eric2340 Infidel :)

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    Yeah, I kind of figured both would be louder than the .45 also. I've been in a 10 x 10 room with a 9mm going off, so I'm somewhat familiar with the report of a non-magnum caliber handgun going off in a small indoor room - so I can just image how much louder a .223 vs a 12 ga would be.

    Thanks -
     
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  7. ActanonVerba70

    ActanonVerba70

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    Reference link:

    http://www.keepandbeararms.com/information/XcIBViewItem.asp?id=2052

    Table 2. SHOTGUN NOISE DATA (DECIBEL AVERAGES)

    .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

    CENTERFIRE RIFLE DATA

    .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
     
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  8. Nemesis.

    Nemesis.

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    Note: according to the experts, any sudden noise trauma 140dB or above will cause damage. That said, the following are dB levels of various firearm calibers/gauges.

    22 caliber rifle 130dB
    .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. In 18" barrel 163.2dB.
    .375 18" barrel with muzzle brake 170 dB.
    .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.
    .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.
     
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  9. rlewpolar

    rlewpolar

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  10. ronin.45

    ronin.45

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    The AR will not only be louder, but the blast and pressure are much worse indoors. An unsuppressed AR can push 170db. No matter who tells you "you won't notice the noise", damage will be done.
    An AR pistol or SBR is even worse.
     
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  11. rlewpolar

    rlewpolar

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    Wonder what a PCC would be? Say a Ruger PCC in 9mm. Anyone have any data?


    Sent from my iPhone using Tapatalk Pro
     
  12. ActanonVerba70

    ActanonVerba70

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    Reference link (Ruger PC Carbine is mentioned):

    https://www.ammoland.com/2019/08/6-reasons-a-pistol-caliber-carbine-makes-sense/#axzz6UvXlMVK2

    From article:

    Noise Level

    For most any imaginable application, less noise is generally a good thing. With far lower operating pressures in the 17,000 to 35,000 operating range, most pistol calibers are quieter than rifle calibers which routinely operate in the 50,000 psi give or take range. For example, from a pistol, a 9mm generates about 158 dB. A .223 Remington AR-type rifle creates 164 dB. Keep in mind that decibels don’t follow normal numerical measurement; they work on a logarithmic scale. That means that 164 dB is not just 4% louder. In fact, a rule of thumb is that every three, yes just three, decibels represent a doubling of sound level. So, a pistol caliber is much, much quieter than a rifle caliber, all else being equal.
     
  13. Eric2340

    Eric2340 Infidel :)

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    THAT is exactly what I figured and also part of why I asked. :(


    I'm really surprised to see the numbers on a 16" AR vs a 12" are just as loud if not louder than a .45 though??

    Guess I can forget my 10mm then............................. :)

    Thanks -
     
  14. rlewpolar

    rlewpolar

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    Thanks, didn’t see an exact decibel figure but still good info. I have a bunch of handguns and rifles readily accessible for HD but my Glock 21 and Ruger PCC are the main ones and I feel they are good choices. I really really really wish I could buy a suppressor here in CA. For those living in a free state, please think of us poor slobs in Cali and buy one...just because you can.


    Sent from my iPhone using Tapatalk Pro
     
  15. AZ Husker

    AZ Husker

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    I've been waiting for the Feds to get done with my paperwork for six months on a suppressor. Might be another six months.
     
  16. DrewBone

    DrewBone

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    The typical brake found on AR's whether in rifle or pistol form will surely rattle your earbones; the shotgun not so much as the blast is directed more forward but still loud as F.

    I'd suggest a suppressed pistol over all else...'much easier to wield than a SBR or AR pistol. And if you ever have to use it in the dead of night the only thing that would awaken those on the other side of the house would be the "thud" of the uninvited guest(s) hitting the floor :D
     
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  17. Green Dragoon

    Green Dragoon

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    Take it from a guy that made his living designing guitar amplifiers. It isn't just the decibels, it is also the frequency. Lower frequencies are harder for the human ear to hear. So, the "boom" of a shotgun may be a lot less painful than the "crack" of a rifle.

    The report of a shotgun will also be more omnidirectional than the tighter, more focused sound pattern of a rifle.

    So, 150 dbls from one gun is not necessarily the same as 150 dbls from another as far as what is more painful, damaging etc. The lower frequency sound patterns are more likely to be felt in the body too.
     
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  18. usmc4641

    usmc4641 NRA member

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    I let off half a mag from an M16 in a 20x10 concrete room in Iraq. It’s been 15 years and I still hear the ringing in my ears. So I’d say the 5.56 round would be painful after the fact.
     
  19. jim goose

    jim goose "The Goose"

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    that’s sucks man. After developing the same, while wearing ear pro all the time, I can’t imagine how veterans don’t all have tinnitus.

    a suppressor is next in my list now.
     
  20. amd65

    amd65

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    So, while you’re popping away with your suppressed, ear safe firearm, the bad guy is cutting loose with AR pistol or 357mag...
    Doesn’t seem like anything to make a priority.
    My dad was a WWII vet, who joined a Guard Cavalry unit before the war. He spent years shooting Machine guns including the .50, the 37mm cannon, and enduring artillery. He was lucky if he had a cig butt in his ears. His hearing seemed fine in his 80’s.
     
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