
Fix Shotgun Shells Won’t Chamber
One of the most common causes is corrosion on the brass base of the shell.
Exposure to moisture, mud, and humidity causes buildup that changes the outer dimensions of the brass.Over time, this can lead to swelling—often referred to as “fat brass”—which prevents the shell from fitting correctly in the chamber.
When a shotgun shell does not chamber properly, it can:
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Stop the gun from going fully into battery
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Prevent the shell from feeding correctly
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Cause delays or missed opportunities in the field
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These issues are mechanical and are caused by the condition of the brass—not the primer or powder.
In many cases, shells that won’t chamber can be restored by cleaning the exterior brass. Removing corrosion allows the shell to return to proper dimensions so it can feed, chamber, and extract as intended.
Shotgun shells are purchased to be used, not set aside. When corrosion is removed, many shells can return to service, reducing waste and improving reliability in the field.
Shotgun shells that won’t chamber are a common issue for hunters. When a shell does not seat properly in the chamber, it can prevent the firearm from cycling and stop a shot before it ever happens.
What Happens When a Shell Won’t Chamber
Waterfowl hunting exposes shells to wet environments, including rain, marsh water, and humidity. Shells are often stored in waders, blinds, or bags where moisture is present, accelerating corrosion over time.
