The three most common cartridge malfunctions are misfires, hangfires, and squib loads. Each one involves a different failure in the ignition chain, from the primer to the powder to the bullet leaving the barrel. Understanding what causes them and how to recognize them keeps you safe at the range and in the field.
Misfires: Complete Failure to Fire
A misfire occurs when the firing pin strikes the primer but nothing happens. The primer fails to ignite the powder, and the gun simply does not discharge. You pull the trigger, hear a click, and that’s it.
Several factors cause misfires. The most common are defective or deteriorated primers, primers that weren’t seated properly during manufacturing, and contamination of the primer or powder by oil or moisture. Ammunition stored in damp conditions for long periods is especially prone to this. Low-quality or very old ammunition also carries a higher misfire risk.
One thing worth knowing: primers are extremely reliable components. Defective primers straight from the factory are rare. If you’re experiencing repeated misfires with different ammunition, the problem is more likely a weak firing pin or worn spring in the firearm itself rather than a string of bad cartridges. You can check this by examining the primer after the failed round. A shallow, off-center, or light dimple on the primer suggests the gun isn’t delivering a strong enough strike, while a deep, centered strike on a round that still didn’t fire points to an actual cartridge defect.
Hangfires: Delayed Ignition
A hangfire is a noticeable delay between the firing pin striking the primer and the cartridge actually discharging. You pull the trigger, nothing seems to happen, and then the gun fires a fraction of a second to several seconds later. This is one of the more dangerous malfunctions because the delay can trick you into thinking you had a misfire, tempting you to lower the gun or open the action before the round goes off.
Hangfires happen when the primer ignites but the propellant powder burns too slowly or only partially catches. Degraded powder, contaminated powder, or a weak primer that produces just enough spark to start a sluggish ignition chain are the usual culprits. Old military surplus ammunition is a common source of hangfires because the powder and primers have had decades to deteriorate.
The standard safety response is the same whether you suspect a misfire or a hangfire: keep the firearm pointed in a safe direction (downrange) and wait. U.S. Marine Corps training protocol calls for a minimum five-second wait after a failure to fire before taking any further action, specifically to guard against a hangfire going off during clearing. If the barrel is hot from sustained firing, that wait extends to 15 minutes to account for the possibility that heat alone could set off a chambered round.
Squib Loads: Bullet Stuck in the Barrel
A squib load is a cartridge that fires with little or no powder behind the bullet. The primer alone may generate just enough force to push the bullet partway into the barrel, where it gets stuck. The bullet never exits the muzzle. Shooters often describe the experience as a “pop and no kick,” a soft, muffled sound instead of the expected bang, paired with almost zero recoil.
This malfunction is particularly dangerous because of what can happen next. If you don’t recognize the squib and fire another round, the second bullet slams into the stuck one. That can cause a catastrophic barrel rupture, potentially destroying the firearm and injuring you or bystanders. The obstruction turns your barrel into a pipe bomb.
Squib loads are caused by cartridges loaded with an insufficient powder charge or no powder at all. In factory ammunition this is rare but not unheard of. It’s more common in hand-loaded (reloaded) ammunition, where a momentary distraction during the reloading process can result in a case that receives a primer but gets skipped on the powder measure.
How to Recognize Each Malfunction
The key differences between these three malfunctions come down to what you hear and feel at the moment you pull the trigger:
- Misfire: A click and nothing else. No sound, no recoil, no discharge.
- Hangfire: A click followed by a pause, then a normal discharge. The delay can range from a split second to several seconds.
- Squib load: A quiet pop instead of a bang, with little or no felt recoil. The gun appears to have fired, but something clearly felt wrong.
The problem is that in the first moment after pulling the trigger, a misfire and a hangfire look identical. You can’t know which one you’re dealing with until either the gun goes off (hangfire) or enough time passes that it clearly won’t (misfire). That’s why the safe response to any failure to fire is the same: keep the muzzle pointed in a safe direction, wait, and only then begin clearing the malfunction.
A squib is easier to identify in the moment because the gun does produce some sound and sensation. The challenge is that new shooters may not recognize how different it feels from a normal shot, especially in a noisy range environment. Any time a round sounds or feels noticeably weak, stop shooting immediately and check the barrel for an obstruction before firing again.
What Increases the Risk
Ammunition quality and storage are the biggest factors. Cheap, poorly manufactured cartridges have higher rates of all three malfunctions. Old ammunition, especially anything stored in humid or fluctuating-temperature environments, degrades over time as moisture works its way into the primer and powder. Military surplus ammo from decades past is a frequent offender.
Reloaded ammunition introduces additional risk. Hand-loaders who use inconsistent powder charges, reuse primers, or fail to properly seat components can create rounds prone to any of the three failures. Case head separation, where the brass casing cracks near the base, is another concern with reloaded brass. Cases that have been reloaded five or six times can develop faint lines near the case head, a sign of metal fatigue that precedes a split. This isn’t one of the “big three” cartridge malfunctions, but it’s worth watching for if you shoot reloads.
Contamination is an underappreciated cause. Over-oiling a firearm during cleaning can leave residue that seeps into the primer pocket or powder charge of a chambered round. Even fingerprint oils on primers during the reloading process can occasionally cause issues. Keeping ammunition dry and clean is one of the simplest ways to reduce malfunction risk.