MEC Shell Checker

The MEC Shell Checker is a precision reloading quality-control tool manufactured by Mayville Engineering Co. (MEC), one of the industry's established names in shotshell reloading equipment. This stainless steel shell checker ensures that reloaded shotshells meet proper roundness and size specifications before firing, preventing chamber-related malfunctions and maintaining consistent shot-to-shot performance.

The tool features precision-machined holes clearly labeled GO or NO GO to test both dimensional accuracy and roundness across six shotshell gauges and bore sizes: 10, 12, 16, 20, and 28 gauge, plus .410 bore. The durable stainless steel construction resists corrosion during long-term storage or humid reloading bench conditions. At only 0.2 pounds and compact at 4.65 x 0.6 x 8.05 inches, the MEC Shell Checker fits easily into a reloader's quality-control kit or bench drawer, making it a practical addition to any shotshell reloading operation.

This checker serves both novice and experienced reloaders who demand consistency in their hand-loaded ammunition. Hunters, sport shooters, and tactical shotgun users benefit from the verification step it provides—confirming that each shell will chamber and fire without deformation-related issues. The GO/NO GO gauge design is straightforward: shells that pass the GO hole but fail the NO GO hole are within spec and safe to use; those that pass NO GO are oversized and must be resized or discarded.

MEC Shell Checker is an affordable, long-lasting quality assurance tool that reduces rejected shells and improves the reliability of hand-loaded shotgun ammunition across multiple gauges and bore types.