A single gunshot is loud enough to cause permanent hearing damage instantly. Every common firearm, from a .22 rifle to a 12-gauge shotgun, produces sound levels well above the 140-decibel threshold where a single impulse noise can mechanically destroy structures inside your inner ear. There is no “safe” number of unprotected shots, and the damage cannot be reversed.
How Loud Firearms Actually Are
OSHA’s longstanding policy treats any impulse noise above 140 decibels as an extreme danger for irreversible hearing loss. For context, a normal conversation is about 60 decibels, and a rock concert hits roughly 120. The decibel scale is logarithmic, meaning every 10-decibel increase represents a tenfold jump in sound pressure. Firearms operate far beyond that danger line.
A .22 LR rifle, often considered a “quiet” gun, produces 139 to 144 decibels depending on the model. Fire that same .22 cartridge from a handgun with a shorter barrel and the peak jumps to 154 to 158 decibels. A 9mm pistol like a Glock 17 hits 163 decibels. A 12-gauge shotgun ranges from about 153 to 162 decibels depending on the load and barrel configuration. None of these are borderline cases. Every one exceeds the threshold for immediate damage, some by more than 20 decibels.
What Happens Inside Your Ear
The inner ear contains thousands of microscopic hair cells that convert sound vibrations into electrical signals your brain interprets as sound. These cells are extraordinarily fragile and do not regenerate in humans. When a gunshot’s pressure wave hits them, the damage happens through two pathways.
The first is direct mechanical destruction. Sound waves above a critical pressure level physically shear and flatten the hair cells, like a windstorm snapping tree branches. This kind of damage is immediate and permanent. The second pathway involves oxidative stress: the intense noise triggers a flood of toxic molecules inside the cells, killing them through a slower chemical process that can continue for hours or even days after exposure. Your body has a natural antioxidant defense system in the inner ear, but a gunshot overwhelms it completely.
The result is sensorineural hearing loss, typically starting in the high-frequency range. You might not notice it right away because conversational speech sits in lower frequencies, but over time you lose the ability to distinguish consonants, understand speech in noisy rooms, or hear warning sounds. Tinnitus, a persistent ringing or buzzing, is another common consequence that often becomes permanent.
Sound Travels Through Your Skull, Not Just Your Ears
Most people think of hearing as sound entering the ear canal, but firearms create pressure waves intense enough to vibrate through your skull and soft tissue directly to the inner ear. This is called bone conduction, and it means that even with your ear canals perfectly sealed, some of that damaging energy still reaches the delicate structures inside. This is one reason why earplugs alone, while helpful, don’t tell the whole protection story for firearms use.
Types of Hearing Protection
Foam Earplugs
Disposable foam plugs are the simplest and cheapest option. When rolled tightly and inserted deep into the ear canal, they expand to create a seal that blocks incoming sound. A well-fitted foam plug typically carries a Noise Reduction Rating (NRR) of 25 to 33 decibels on the label. However, real-world performance is lower than lab conditions suggest. OSHA recommends subtracting 7 decibels from the labeled NRR and then cutting the result in half. So a plug rated at 33 NRR provides roughly 13 decibels of effective reduction in practice. That’s meaningful, but it won’t bring a 163-decibel gunshot anywhere close to safe levels on its own.
Foam plugs also block all sound equally, making it harder to hear range commands, conversation, or approaching footsteps while hunting.
Passive Earmuffs
Over-the-ear muffs use foam padding and a hard shell to physically block sound. They’re reliable, require no batteries, and are easy to put on correctly (a real advantage over earplugs, which many people insert poorly). Their NRR ratings typically fall between 22 and 31 decibels. Critically, because they cover the bone behind the ear, muffs also reduce some of the vibration that travels through the skull via bone conduction, something earplugs cannot do.
Like foam plugs, passive muffs muffle everything indiscriminately. Voices and environmental sounds become difficult to hear.
Electronic Earmuffs
Electronic muffs use built-in microphones and digital sound processing to treat quiet and loud sounds differently. They amplify low-level sounds like speech and ambient noise while automatically suppressing anything above about 82 decibels. Two main technologies handle the suppression: clipping, which shuts off all sound once it crosses a threshold, and compression, which scales loud sounds down to a safer volume without cutting them off entirely. Compression tends to be more practical because you can still hear range commands or a hunting partner’s voice even in the fraction of a second after a shot.
The passive noise reduction of electronic muffs is comparable to standard earmuffs. The electronics add situational awareness on top of that protection, letting you stay alert to your surroundings without sacrificing safety.
Why Doubling Up Matters
For the loudest firearms, wearing both earplugs and earmuffs simultaneously is the most effective strategy. OSHA’s rule of thumb: take the NRR of whichever device is rated higher, then add 5 decibels. In practice, an earmuff adds about 4 decibels of protection on top of a well-fitted foam earplug, or about 7 decibels on top of a pre-molded plug. The maximum real-world attenuation most people can achieve with dual protection is 35 to 50 decibels depending on the sound frequency.
This combination also addresses both pathways of sound entry. The earplugs seal the ear canal against airborne sound, while the earmuffs reduce bone conduction vibrations traveling through the skull. Neither alone provides complete coverage. Together, they bring even the loudest handgun rounds much closer to safe levels.
Cumulative Damage Adds Up Fast
One of the most dangerous misconceptions about shooting without protection is that it’s fine if you only do it “once in a while.” Each unprotected exposure kills hair cells that never come back. A hunter who fires a few unprotected shots each season for 20 years accumulates damage with every single round. The loss is gradual enough that you might not notice it until a hearing test reveals significant deficits, typically years after the damage began.
Shooters also tend to lose hearing asymmetrically. Right-handed rifle shooters often have worse hearing in their left ear, which sits closer to the muzzle. This pattern is so well recognized that audiologists use it as a diagnostic clue for noise-induced hearing loss from firearms.
Choosing the Right Protection
Your choice depends on the shooting environment and how loud your firearm is. For a .22 rifle at an outdoor range, properly fitted foam plugs or passive muffs may provide adequate reduction. For centerfire handguns, shotguns, or any indoor range (where sound reflects off walls and intensifies), doubling up with plugs and muffs is the safer approach. Electronic muffs are worth the investment if you shoot regularly, hunt, or train in group settings where hearing commands and conversation matters.
Fit is everything. A $2 foam earplug inserted correctly outperforms a $50 earmuff that doesn’t seal against your head because of glasses or a hat. When using foam plugs, roll them into a tight cylinder, pull your ear up and back with the opposite hand to straighten the ear canal, and insert the plug deep enough that it sits flush with the opening. If you can easily grab and pull it out, it’s not deep enough.