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Ear Protection for Shooting: How Much NRR You Really Need

Autori Matúš Koleják, Braňo Hrivňák 20 min čítania
Ear Protection for Shooting: How Much NRR You Really Need
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The short version

A gunshot measures about 144 dB peak at the shooter's ear for a .22 rifle, about 159 to 162 dB for a 9mm pistol or a 12 gauge shotgun, and up to 172 dB for a .357 revolver, according to NIOSH measurements. The OSHA and NIOSH limit, and the EU exposure limit, is 140 dB peak, so one unprotected shot is already over it. A well-fitted earplug or earmuff takes roughly 30 dB off the peak. Plugs and muffs together take off about 45 to 50 dB. That is why NIOSH recommends double protection every time you shoot, and especially indoors. The NRR on the box is measured with steady noise, not gunfire, so use it to compare products, not as a promise. Fit matters more than the number: glasses under a muff can cost 20 to 30 dB. Electronic muffs and filter earplugs do not block more than plain ones. Their advantage is that you can hear speech and range commands between shots.

This guide is for anyone buying hearing protection for the range, for duty training or for hunting, and for anyone wondering whether the plugs or muffs they already own are enough. It explains how loud firearms really are, what the protection ratings mean, which type suits which situation, when to wear two layers and how to fit them so they actually work. We sell hearing protection, including Safariland and TCI products, so we have an interest here. We say where a figure comes from, and where our own product information is unclear, we say that too.

How we wrote this guide

  • The sound levels, limits and protection figures come from NIOSH (the US National Institute for Occupational Safety and Health), OSHA, the EU noise directive, the National Hearing Conservation Association and peer-reviewed studies. All are linked at the end.
  • We have not measured any gunshots or hearing protectors ourselves. We have no sound lab, so we give no test results of our own.
  • Product specifications are the manufacturers' claims. Where a claim does not add up, we explain why.
  • This is general safety information, not medical advice. If you already have ringing in your ears or muffled hearing after shooting, see an audiologist or doctor.
  • The photos are illustrations generated from our product photos, not pictures of real users. The chart is ours, drawn from the NIOSH figures.

How loud is a gunshot?

Louder than almost anything else you will hear voluntarily. Sound level meters and phone apps cannot measure it properly. NIOSH researchers found that standard noise dosimeters "clipped" gunshots at about 146 dB when the real peak was 163 dB. The numbers below come from NIOSH and from published studies that used laboratory microphones at the shooter's ear.

Firearm Peak level at the shooter (dB SPL) Source
.22 rifle About 144 NIOSH, Murphy et al. 2007
9mm pistols (Sig P228, Colt Pocket9), .40 pistol About 159 to 162 (indoor range) NIOSH evaluation of a police SWAT team, 2003
12 gauge shotgun About 159 to 161 NIOSH 2003 and 2007
.223 / 5.56 rifle, no suppressor About 148 to 161, depending on barrel and position Murphy et al. 2016, cited by NHCA
.223 rifle with an 8.5" barrel About 167 (outdoor range) NIOSH 2003
.357 Magnum revolver About 167 to 172 NIOSH 2003 and 2007
Suppressed .223 / .308, supersonic ammunition About 120 to 137 Murphy et al. 2016, cited by NHCA

The National Hearing Conservation Association (NHCA) sums it up in its 2017 position statement: "Almost all firearms generate impulse levels in excess of 140 dB peak SPL." Big-bore rifles, pistols and shotguns typically produce 160 to 170 dB.

Chart of gunshot peak levels: about 144 dB for a .22 rifle, 159 to 162 dB for 9mm and 12 gauge, 167 to 172 dB for a .357 revolver, against the 140 dB limit, and a 160 dB shot reduced to about 130 dB by one protector and about 110 to 115 dB by plugs plus muffs
Gunshot peak levels at the shooter's ear (NIOSH) and the effect of single and double protection.

Several things make it louder:

  • Indoor ranges. Walls and ceilings reflect the sound, so the impulse lasts longer and the peak can be higher. NIOSH measured up to 163 dB inside a police range.
  • Muzzle brakes and short barrels. The NHCA notes that brakes "often increase the peak sound pressure levels measured at the ears of the shooter", and that short barrels make it worse.
  • Shooting from a bench or table. The flat surface reflects sound back to your head.
  • The shooter next to you. You are exposed to every shot on the line, not only your own. In one calculation, a bystander one metre behind an unprotected shooter could safely hear one shot or fewer.

Suppressors help but do not make a firearm safe to shoot without ears. Studies found reductions of 7 to 32 dB, and several suppressed conditions were still above 140 dB. The NHCA's advice is to wear hearing protection "whenever shooting firearms, including when employing a noise suppressor".

Why 140 dB is the line

Impulse noise damages hearing differently from a loud workplace. A single very short peak can injure the inner ear. Regulators therefore set a peak limit on top of the familiar daily-average limits.

Who Peak limit Notes
OSHA (US workplaces) 140 dB peak SPL Impulse noise "should not exceed" it
NIOSH (US research body) 140 dB peak SPL Same recommendation
EU Directive 2003/10/EC 140 dB(C) exposure limit; action values at 135 and 137 dB(C) The limit may count the hearing protector; the action values may not
World Health Organization, children 120 dB peak About 20 dB stricter than for adults

The goal of shooting hearing protection is therefore simple: bring the 145 to 170 dB at your ear down below 140 dB, with a margin for imperfect fit. For children, it needs to come down below 120 dB.

What NRR means, and what it does not

NRR, the Noise Reduction Rating, is the number in decibels printed on hearing protectors sold in the US. In Europe you will see SNR (Single Number Rating) and H/M/L values instead, under the EN 352 standards. The two are measured differently and cannot be converted one into the other.

Three things about NRR matter for shooters:

  1. It is measured with steady noise, not gunfire. NIOSH puts it plainly: protectors are tested with continuous noise, and "the attenuation of a protector used in impulsive noise may not be the same." For impulses, the NHCA says the real reduction is similar to the NRR or can be higher. So NRR is a fair way to compare two products, not a guarantee for a gunshot.
  2. It is measured with a perfect fit. The US test still follows a 1974 method in which an experimenter fits the protector. People fit their own less well. That is why regulators "derate" the label.
  3. The test rule is old. The US EPA proposed a new labelling method in 2009, including an impulse test, but we found no sign that it was ever finalised. OSHA still refers to the 1979 rule.
Derating method How it works NRR 33 earplug becomes NRR 25 earmuff becomes
OSHA, A-weighted Subtract 7 dB 26 dB 18 dB
OSHA field estimate Subtract 7, then halve 13 dB 9 dB
NIOSH, by type Muffs minus 25%, foam plugs minus 50%, other plugs minus 70% 16.5 dB if foam, 10 dB if pre-moulded 19 dB

These are rules for steady workplace noise, and they are deliberately cautious. They are useful for one lesson only: a protector that does not seal in your ear or around your head delivers a fraction of its label.

How much NRR do you need for shooting?

Work from the gunshot, not the label. A 9mm or a shotgun puts about 160 dB at your ear, so you need at least 20 dB of real peak reduction to reach 140, and more for margin. Measured in the lab with gunfire-type impulses, a well-fitted foam plug or a good passive muff takes about 30 to 36 dB off the peak. That is enough for one device in most outdoor pistol and rifle shooting, if it fits properly.

NIOSH researchers give a concrete example in the Hearing Review article cited below. A 12 gauge shotgun measured 161 dB peak at the shooter. A passive earmuff brought it to 130 dB, which by NIOSH's formula allows only about five shots a day. Adding a deeply inserted foam earplug under the muff raised the allowance to more than 1,200 shots. The extra layer made the difference between a short session and a training day.

So, in practice:

  • NRR in the high 20s to low 30s, well fitted: fine for one person shooting a .22 or a pistol outdoors.
  • Indoors, magnum calibres, short barrels, braked rifles, long sessions or a full firing line: double up, whatever the NRR.
  • Children: double up. Their limit is about 20 dB lower.

Do not chase the highest number. Past a point, sound reaches the inner ear through the skull and soft tissue, around any protector. Research puts this bone-conduction limit at roughly 40 to 60 dB depending on frequency. A plug with a few more dB on the box gains little if it sits less deep in your ear.

Types of hearing protection for shooting

Four kinds of shooting hearing protection floating in a row on white: foam filter earplugs on a cord, triple-flange filter earplugs, compact passive earmuffs and olive electronic earmuffs
From left: foam filter plugs on a cord, flanged filter plugs, compact passive earmuffs, electronic earmuffs. Illustration generated from our product photos.
Type Peak reduction (lab, well fitted) Good at Weak at
Foam earplugs About 34 to 38 dB (NIOSH test of one model) Highest protection per euro, fit under any helmet, glasses or stock Easy to insert badly; you hear little speech; single use
Reusable flanged earplugs Depends on fit; NIOSH derates them most (70%) because the seal is less reliable Washable, quick to put in, cheap over time Need the right size; seal varies with ear shape
Passive earmuffs About 29 to 36 dB (one model tested by NIOSH); about 30 dB in field use Easy to fit right, quick on and off, good as the second layer Leak with glasses, beards and long hair; bulky against a rifle stock
Electronic earmuffs Similar to passive muffs of the same build Amplify speech and quiet sounds, cut off gunshots automatically Batteries, cost; the same seal problems as any muff
Level-dependent filter earplugs About 20 to 31 dB in open mode on impulses in one NIOSH study; little against steady noise Let you hear speech and commands with no batteries Less peak protection than a foam plug; depend completely on the seal

The lab figures come from a 2012 NIOSH study that fired impulses of 130 to 170 dB at protectors on a test head. Tested models were a foam plug, a passive muff and the 3M Combat Arms filter plug. Other models will differ, but the pattern holds: a well-fitted plain foam plug did slightly better than the muff, and the filter plug did less well in open mode.

How "impulse" filter earplugs work

Filter earplugs, also called level-dependent or non-linear plugs, have a tiny channel through the middle. At normal sound levels, air moves through it freely and you hear speech, a little muffled. A gunshot drives air through the channel so hard that the flow becomes turbulent and the channel effectively closes. NIOSH researchers describe it as "a small orifice that provides increasing acoustic impedance as the pressure differential increases." There are no electronics and no batteries. The idea came from the French-German research institute ISL and is used in military plugs such as the 3M Combat Arms.

The trade-offs are real and few product pages mention them:

  • Less peak protection than a solid plug. The NHCA notes that a filtered plug "will not exceed" the protection of the same plug with the filter blocked.
  • Little protection against steady noise in open mode. The 3M Combat Arms was rated NRR 7 open and around NRR 22 to 23 closed. That matters near generators, engines or helicopters.
  • Everything depends on the seal. A plug that sits loosely in the ear protects little, filter or not. The 3M Combat Arms case, which 3M settled in 2023 for USD 6 billion without admitting liability, was about plugs that could loosen in the ear.

Where they shine: instructors, range officers, hunters and anyone who needs to hear speech between shots, and as the inner layer under a muff. They are not the best choice as your only protection on a busy indoor range.

Electronic earmuffs: what the electronics do

An electronic muff is a passive muff with microphones and a small amplifier inside. It amplifies quiet sounds, so you hear speech, range commands and footsteps, and when a loud sound arrives it limits or cuts the output in a fraction of a millisecond. Honeywell, for example, lists a 0.5 millisecond attack time for its Impact Sport Bolt.

Two points matter when you buy:

  • The electronics do not add protection. NIOSH found that the amplifier setting had little effect on peak reduction. The shot is stopped by the cup and the seal, as in a passive muff. Compare electronic muffs by their passive rating and by how well they seal on your head.
  • What you pay for is awareness and comfort. Being able to hear without lifting a cup means you keep your protection on, which is often where the real gain lies. Duty and military models add radio connections and low-profile cups that work with helmets and rifle stocks.

In the EU, check the certification. Hearing protectors are personal protective equipment and must carry the CE mark with an EN 352 rating. Some US models are ANSI rated but not CE marked: TCI states this about its own Liberator HP, which we sell.

When to double up

NIOSH's advice to shooters is the strictest in this guide: "NIOSH recommends that hunters and shooters use double hearing protection every time a weapon is fired… The best combination is a deeply-inserted foam earplug and a well-seated earmuff." In a 2003 NIOSH evaluation of a police SWAT team, plugs plus muffs added 15 to 20 dB over a single device. The NHCA reports roughly 50 dB of peak reduction with double protection against about 30 dB with one device.

You may see a rule that doubling up only adds 5 dB. That is an OSHA compliance rule for steady workplace noise and is deliberately conservative. Measurements on gunfire show more.

Situation What we would wear
Outdoor range, .22 or pistol, few shooters One well-fitted device; double up if the session is long
Indoor range, any calibre Plugs plus muffs
Rifle with a muzzle brake, short barrel, magnum handgun Plugs plus muffs, and keep distance from braked rifles on the line
Instructor or range officer, all day on the line Filter plugs or foam plugs under electronic muffs
Hunting, where you need to hear game Electronic muffs or filter plugs, deeply fitted
Children and new shooters Plugs plus muffs, every time; a range kit with both is the simplest start
Duty use with radio Electronic communication headset; add plugs indoors

How to fit hearing protection so it works

Most failed hearing protection is not a bad product. It is a bad fit.

Foam earplugs: roll, pull, hold

  1. Roll the plug between your fingers into a thin, tight cylinder.
  2. Pull the top of your ear up and back with the opposite hand to straighten the ear canal.
  3. Hold the plug in with a finger for 20 to 30 seconds while it expands.

Check it: most of the foam should be inside the canal, not sticking out. Cup your hands over your ears. If sounds get much quieter, the plug is not sealing. Take it out and fit it again. This method and check are NIOSH's.

Reusable and filter plugs

Try both sizes of tip. The right one feels snug and blocks your own voice slightly. Pull the ear up and back while inserting, and push until the flanges sit inside the canal. Clean them as the maker says.

Earmuffs

  • Glasses are the biggest leak. In the NIOSH SWAT evaluation, the gap around a glasses arm reduced the peak protection of muffs by 20 to 30 dB. Use glasses with thin, flat arms, or wear plugs under the muffs.
  • Beards, long hair, hats and hoods under the cushions also break the seal.
  • With a rifle, a bulky cup hits the stock and lifts. Low-profile cups or plugs solve this.
  • Replace hard or cracked cushions. They stop sealing long before the muff looks worn out. Gel or memory foam replacement seals are available for many duty headsets.

What we sell, and what to know about it

We sell several of the types above. Here is what the manufacturers claim and where we see open questions.

  • Safariland Pro-Impulse reusable filter earplugs: triple-flange tips in two sizes, a filter, no batteries and an aluminium key-chain case. Be careful with the "NRR 33" on our listing. Our text copies the manufacturer's older wording. Independent reviews of the same plug quote Safariland's figures as 33 dB of peak (impulse) reduction and 13 dB of continuous reduction. A vented filter plug with a true NRR of 33 would be unusual. Our reading is that 33 is an impulse figure, not an EPA NRR, and we are checking the packaging to correct our listing. Safariland's current successor, the Pro Impulse Plus, is listed with an impulse rating (IPIL) of 41.7. Some press reports call that an NRR, which it is not.
  • Safariland Foam Impulse: memory-foam tips with the same kind of filter, on a neck cord. Safariland states 38 dB peak impulse reduction plus 13 dB continuous in Impulse Mode, and 20 dB continuous in Full-Block Mode. These are clearer figures than the Pro-Impulse wording.
  • Safariland Impulse Range Kit: Foam Impulse plugs, compact passive earmuffs and safety glasses. It is built for doubling up, and Safariland itself recommends the muffs as a second layer, "especially indoors".
  • TCI DEHP and TCI Liberator HP 2.0: electronic muffs built for duty, with low-profile cups and an upgrade path to radio headsets. TCI states that the Liberator HP is ANSI certified but does not yet have CE certification. For an employer in the EU, that can rule it out as workplace PPE. Ask us before ordering.

For radio-connected duty headsets, see our tactical headsets. All hearing products are in our hearing protection collection. If you are building a full range or duty kit, our guides to duty belt setup, battle belt setup and what goes in an IFAK cover the rest of the equipment.

Common mistakes

  • Taking protection off between strings of fire. The shooter next to you keeps shooting. Electronic muffs and filter plugs exist so you can leave them on.
  • Trusting the NRR number more than the fit. A loosely fitted NRR 33 plug can protect less than a well-fitted muff with a lower rating.
  • Glasses with thick arms under muffs. Up to 20 to 30 dB lost.
  • One layer indoors. Indoor peaks are higher and last longer. Double up.
  • Counting on a suppressor. Many suppressed shots are still above 140 dB.
  • Ignoring ringing ears. The NHCA calls tinnitus "one of the early warning signs" of noise-induced hearing loss. If your ears ring after shooting, your protection failed that day.
  • Forgetting the left ear. For right-handed shooters, the left ear is usually the more damaged one, because it faces the muzzle when shooting a long gun. Check that side's seal twice.

Frequently asked questions

How loud is a gunshot in decibels?

At the shooter's ear, about 144 dB peak for a .22 rifle, about 159 to 162 dB for a 9mm pistol or a 12 gauge shotgun, and 167 to 172 dB for a .357 revolver, according to NIOSH measurements. Indoor ranges, short barrels and muzzle brakes push the levels higher.

How much NRR do I need for shooting?

Enough to bring about 160 dB below 140 dB with a margin, which in practice means a well-fitted protector in the high 20s or low 30s for outdoor pistol shooting. Indoors, with magnums, braked rifles or long sessions, wear plugs and muffs together whatever the rating.

Is NRR 33 enough for shooting?

For most outdoor pistol and rifle shooting, a well-fitted NRR 33 foam plug is enough on its own. NIOSH still recommends adding a muff every time, and it is necessary indoors and with very loud firearms. Also check what the 33 refers to: some filter plugs quote a peak reduction, not an EPA NRR.

Are earplugs or earmuffs better for shooting?

In NIOSH lab tests, a well-fitted foam plug took slightly more off a gunshot than a passive muff, around 34 to 38 dB against 29 to 36 dB. Muffs are easier to fit correctly but leak with glasses. Plugs fit under helmets and against rifle stocks. The best answer for loud shooting is both.

Is double hearing protection necessary?

NIOSH recommends it every time a weapon is fired, and it is strongly advised indoors, for children and with loud firearms. Measurements show plugs plus muffs add about 15 to 20 dB over one device.

Can I hear range commands with earplugs in?

With foam plugs, speech is muffled but often understandable. Level-dependent filter plugs and electronic muffs are designed to let speech through while blocking gunshots. One reviewer of Safariland's in-ear Impulse plugs reported hearing range commands, the timer and steel hits.

Is electronic hearing protection better than passive?

Not for protection. The electronics do not stop more of the shot. They let you hear speech and surroundings between shots, so you keep the protection on. Choose electronic muffs for awareness and comfort, and judge their protection like any passive muff.

What hearing protection is best for an indoor range?

Foam or well-fitted filter plugs under earmuffs. Indoor ranges reflect sound, peaks reached 163 dB in a NIOSH study, and neighbours shoot at the same time. ASHA, the American Speech-Language-Hearing Association, also advises double protection indoors.

A note on law and safety

Employers in the EU must provide hearing protection under Directive 2003/10/EC and national law, and hearing protectors sold as PPE must meet the EU PPE Regulation. Range rules may set their own minimums. This guide is general information about protecting your hearing when shooting lawfully. It is not medical advice. If you notice ringing, muffled hearing or pain after shooting, stop and have your hearing checked by an audiologist or doctor.

About the authors

This guide was written by Matúš Koleják and Braňo Hrivňák of Combat Defender in Bratislava, Slovakia. We sell hearing protection, communication headsets, holsters and duty equipment to police, military, security and sport-shooting customers in Europe. We are not audiologists or acousticians.

The sound levels and protection figures come from NIOSH reports and studies, the NHCA position statement, OSHA and the EU noise directive. Product specifications are the manufacturers' own. The recommendations for each situation are our judgement based on those sources. The illustrations were generated with an AI image model from our product photos and checked by us. They are not photographs. If something here is wrong or unclear, tell us and we will correct it.

Last reviewed: October 2026.

Sources

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