The 22 magnum doesn't have a much louder report - maybe 1db. 223/5.56 typically requires a 33db suppressor to quiet the muzzle report and the sonic noise of the bullet traveling through air is. With a comparison between the.222 and the.223 using the same bullet style and weight of 50 grains (3.23 g), the former has an average velocity of 3.200 ft/s (975.36 m/s), while the.223 musters a 200 ft/s advantage, trotting along 3.400 ft/s (1036.32 m/s).

I have read more than once on this forum that a 223 will not be hearing safe even suppressed, but many 30 cals may be hearing safe. I am about to pull the trigger on a 223 bolt rifle and my choices are a 24' or a 20' tube. I will run it suppressed. I have several 22LRs, ranging from 16' to 27' with varying barrel profiles, and there is a huge difference in volume between them using the same ammo (16' 10/22 vs no taper Walther KKM). I believe most of this difference, but maybe not all, has do do with the amount of burned/un-burned powder. My 3 questions are:1. By going with a longer barrel am I mitigating more noise, running suppressed and all other things being equal?2.

Does barrel profile make a difference in noise level? I suppose the question here is if the initial powder ignition makes all that much noise which would then need to vibrate the barrel and send that noise to our ears, or if the boom only happens as gases expand when exiting the barrel.2.

Is there something about the 223 shape/size/speed. That makes it noisier than any other caliber? I have experience with a 155mm round passing just overhead and it sounded (and felt) like a freight train going sideways. I assumed it was just disturbing a greater volume of air so it was really loud relative to a 7.62. That assumption means that a projectile punching a smaller hole in the atmosphere (223 vs 308, for instance) would be less noisy. I'm guessing I'm wrong on this, I just have no idea why.Thanks.

Re: 223 Noise Questionsi shoot my AR with my YHM 30 caliber can. It is still loud. Louder than the 308 rifle. A 308 moves at 2400ish FPS, and the 5.56 moves at 3000ish FPS.

The faster the speed, the louder the sonic boom. The bigger the projectile, the loader the sonic boom.as far as the longer barrel:22 high velocity thru my sig 226 (suppressed YHM cobra 9mm) is quieter than a paintball gun.

It only has 5' to burn the powder.the same ammo thru my reminton 597 rifle (suppressed YHM cobra 9mm), you hear the sonic boom, but it is hearing safe. It has a 16.5' barrel to burn the powder.i know this isn't the same ammo, but the rules still apply.hope this helps. Re: 223 Noise QuestionsYou hit it with #3, the velocity of the 223 round is high which makes a very loud sonic crack.Most quality cans are hearing safe, meaning they remove the sound signature of the round going off, but you will still hear the very loud crack running downrange.Unfortunately, many blame this sound on the suppressor for not being efficient enough to be hearing safe. Naturally if you are shooting suppressed in an enclosed area, especially with trees and such, it will be louder on the ears.

Hp envy software. Re: 223 Noise Questionsa 223 from a bolt gun shot through a good can will be ear safe, I shoot a 22-250AI through a good 223 can (form 1) and its ear safe even at 4,000fps muzzle velocity.I run a very well built form 1 can on a 10.5' AR and its quiet maybe a tiny bit louder than a 10/22 shooting Stingers which i dont consider ear safe but its WAY quieter than any centerfire 22 cal or center fire pistol from a carbine, I believe im getting alot of noise from the desgine of the gas system. This 10.5' AR is louder with a Surefire suppresor than the form 1 but their is a slight size differance.Get a good can, have the barrel theaded properly and enjoy shooting. Re: 223 Noise QuestionsNo, it won't be ear safe.No supersonic projectile is truly ear safe.No, a longer barrel will not make any difference.Some in the industry have really done the public a disservice by suggesting that any suppressed supersonic round is 'ear safe.' One can work up to approx. 88 dBs before hearing is at risk.To help understand this better, lets examine a.308 and account for the projectile signature alone, not the blast. Even in the subsonic range, even before transonic (lets say 300mps as measured at 5m from the end cap) the dB is over 90. If we were to measure sonic signature as it leaves transonic (lets say 308mps @ 5m from end cap) we are already registering 137dB and are above the pain level.223 is very much the same in every regard with projectile signature (breaking sound barrier.) Having said that, a majority of.223 cans do a poor job at suppression of the blast.

That has to do with a combination of three things. The velocity of the cartridge, the types of powders used especially in short barrels and the misunderstanding of the role of volume in these instances.Shooting suppressed is the responsible thing to do for your ears. It allows you to be able to use plugs and muffs and not have a majority of the damage that normally occurs.chase right up your jaw bone and into your middle ear.P.S. There are a great number of studies on.22 barrel length and accuracy. At 27' you may be doing more harm than good.

Re: 223 Noise QuestionsYes, use both a suppressor and good hearing protection to keep your ears safe.An average muzzle blast for center fire cartridges ranges from 150 up to 170 db.A good suppressor usually accounts for about 30 db.Good hearing protection accounts for about 30 db.This puts you down to the 100 to 110 db range which is far safer than 130 to 140 which is what you would have with using just either a suppressor or just hearing protection.130 to 140, depending on what data you read, is the level of certain hearing damage. Your ears can possibly handle SOME limited levels in the 100 to 120 range without certain damage. Higher the db level, the less time you can safely tolerate.Other things to consider is where you are shooting, under a roof for example will amplify sound, as well as other people's blast go into your noise quota for the day too, if they are close by.Bottom line, shoot suppressed AND with hearing protection WHENEVER possible, especially at matches or on the range where sustained fire can add up quickly.There is NO CURE for hearing loss, as of now.and i did not learn about all this cause I thought it was fun, wish I knew before what I just wrote here. Re: 223 Noise QuestionsOriginally Posted By: MaxnMosesI have read more than once on this forum that a 223 will not be hearing safe even suppressed, but many 30 cals may be hearing safe.

I am about to pull the trigger on a 223 bolt rifle and my choices are a 24' or a 20' tube. I will run it suppressed. I have several 22LRs, ranging from 16' to 27' with varying barrel profiles, and there is a huge difference in volume between them using the same ammo (16' 10/22 vs no taper Walther KKM). I believe most of this difference, but maybe not all, has do do with the amount of burned/un-burned powder. My 3 questions are:1.

By going with a longer barrel am I mitigating more noise, running suppressed and all other things being equal?2. Does barrel profile make a difference in noise level? I suppose the question here is if the initial powder ignition makes all that much noise which would then need to vibrate the barrel and send that noise to our ears, or if the boom only happens as gases expand when exiting the barrel.2. Is there something about the 223 shape/size/speed. That makes it noisier than any other caliber?

I have experience with a 155mm round passing just overhead and it sounded (and felt) like a freight train going sideways. I assumed it was just disturbing a greater volume of air so it was really loud relative to a 7.62. That assumption means that a projectile punching a smaller hole in the atmosphere (223 vs 308, for instance) would be less noisy.

I'm guessing I'm wrong on this, I just have no idea why.Thanks This is not hard, Hearing damage starts to occur around 85Db. No suppressor for any supersonic round on the planet reduces sound down to near this level.124Db is about as close to as quiet as it gets. Re: 223 Noise QuestionsAll you dedicated ear plug, muff and/or suppressor users, have you ever read this: (scroll to bottom for commentary)Original Research—Otology and NeurotologyComparison of Muzzle Suppression andEar-Level Hearing Protection inFirearm UseOtolaryngology–Head and Neck Surgery144(6) 950–953.

You will have the ability to export references directly from Highwire Press, Ovid, OCLC and more. Reference manager 12 torrent download. Please direct any questions or bugs regarding software to the company that developed the program.Rocket Download is not responsible for any problems that may occur from downloading or installing software that listed here.We are merely a software download directory and search engine of shareware, freeware programs available on the Internet.However report a problem you have had with any individual software listed here and we will delete it promptly. Reference Manager 12 will also allow you to create bibliographies in Microsoft Word with Cite While You Write instant formatting.System requirements:Not specifiedPrice:$249.95. This way you will reduce your data entry time and costs, while you build your personal reference collection from hundreds of online databases.Through the Database Manager features of Reference Manager, you will be able to organize your personal reference collection, with files attached to the entries, links to the web, key operations between databases, spell and syntax checker and global record edition.Your references can be later published on the web or an intranet, or shared into a network, since the program allows multiple users to read and write the same database.

American Academy ofOtolaryngology—Head and NeckSurgery Foundation 2011Reprints and permission:sagepub.com/journalsPermissions.navDOI: 10.11811398872Matthew Parker Branch, MD1No sponsorships or competing interests have been disclosed for this article.AbstractObjective. To compare noise reduction of commercially availableear-level hearing protection (muffs/inserts) to that offirearm muzzle suppressors.Setting. Experimental sound measurements under consistentenvironmental conditions.Subjects. None.Study Design and Methods. Muzzle suppressors for 2pistol and 2 rifle calibers were tested using the Bruel &Kjaer 2209 sound meter and Bruel & Kjaer 4136microphone calibrated with the Bruel & Kjaer Pistonphoneusing Military-Standard 1474D placement protocol. Fiveshots were recorded unsuppressed and 10 shotssuppressed under consistent environmental conditions.Sound reduction was then compared with the real-worldnoise reduction rate of the best available ear-levelprotectors.Results. All suppressors offered significantly greater noisereduction than ear-level protection, usually greater than50% better.

Noise reduction of all ear-level protectors isunable to reduce the impulse pressure below 140 dB forcertain common firearms, an international standard for preventionof sensorineural hearing loss.Conclusion. Modern muzzle-level suppression is vastly superiorto ear-level protection and the only available form ofsuppression capable of making certain sporting arms safefor hearing.

Re: 223 Noise QuestionsOriginally Posted By: mavrick102000This is not hard, Hearing damage starts to occur around 85Db. No suppressor for any supersonic round on the planet reduces sound down to near this level.124Db is about as close to as quiet as it gets. Where are you getting these Db numbers in relation to hearing damage from?How can they claim that 85Db hearing damage can occur, when many quality 22lr cans are in the 112-120 Db range and are no where near loud enough to damge hearing. Re: 223 Noise QuestionsMike,Decades of OSHA and NHCA data. Both in sustained dB and impact dB. Not much mystery left to it anymore. 85 dB is settled science for quite some time now.In most instances, this is the point in the conversation that some say 'its 85 dBs for 8 hours within 24 hours.'

And.they would be right. That is about the time someone explains that every 3 dB increase is approx a doubling of sound pressure. And they would be right. Then someone remembers that that translates to a halving of the exposure time. And they would be right. Then someone suggests that.22s average about 124 dB without any reflective surfaces. And they would be right.Hearing damage is an accumulative affair.

Trust in me,.22 will destroy your hearing. Don't let it happen.