Mec Super Sizer 12Ga
The Mec Super Sizer 12Ga is a dedicated shotshell case prep tool built to restore fired hulls to factory specifications. Whether you're a new reloader just setting up your bench or a seasoned hand looking to upgrade, this sizer handles the critical first step of shotshell reloading—bringing the base of your 12-gauge empties back to their original dimensions so they'll chamber and perform reliably in your shotgun.
The core innovation here is MEC's Power-Ring collet resizing device, which does the heavy lifting for you. Eight sturdy steel fingers encircle the shell base and apply even, consistent pressure as you work the ram. This multi-point contact ensures the base gets resized uniformly—no pinching, no high spots—which matters when you're counting on consistent chamber fit and reliable function downrange. The process requires minimal effort thanks to the intelligent lever geometry, so you won't fatigue your hand or wrist during long reloading sessions.
Built from durable steel throughout, the Mec Super Sizer is designed to accept shotshells of any length, making it versatile across different load types and your hunting or sport-shooting needs. All mounting hardware comes included, and the unit integrates seamlessly as an upgrade to conventional MEC reloading equipment or as a standalone station in your setup. This is the kind of tool that pays for itself in consistency and saved labor over the course of a few hundred shells.
Key Features
- MEC Power-Ring collet resizing system for precise, even base restoration
- Eight steel fingers apply uniform pressure across the shell base
- Accepts all lengths of 12-gauge shotshell
- Steel construction for durability and longevity
- Minimal physical effort required—intelligent lever design reduces hand fatigue
- Designed to upgrade existing MEC reloading equipment or work as a standalone tool
- All necessary mounting hardware included
Specifications
| Gauge | 12 |
| Type | Shotshell Case Sizer |
| Resizing Method | Power-Ring Collet Device |
| Finger Design | Eight Steel Fingers |
| Material | Steel Frame |
| Compatibility | All lengths of 12-gauge shotshell |
Frequently Asked Questions
What does a shotshell sizer do, and why do I need one?
Fired shotshell bases expand slightly during shooting. A sizer restores them to factory dimensions so they'll chamber reliably in your shotgun and perform consistently in your reloader. The Mec Super Sizer brings that base back to its original size with the Power-Ring collet system, ensuring uniform fit across all your reloads.
Can the Mec Super Sizer handle different shotshell lengths?
Yes. The Mec Super Sizer is designed to accept all lengths of 12-gauge shotshell, so you can resize both 2¾" and 3" hulls without changing tools or buying separate equipment.
What's included with the Mec Super Sizer?
The sizer comes complete with the Power-Ring collet resizing device and all necessary hardware for mounting and operation. No additional parts are required to get started.
Will this sizer work with my existing MEC reloading setup?
Yes. The Mec Super Sizer is designed to integrate as an upgrade to conventional MEC reloaders, though it also functions effectively as a standalone resizing station on your bench.

