Description
If you shoot a lot of .410 and factory shells have gotten tough to find or pricey, the MEC Sizemaster is the kind of press that pays for itself over time. It's a steel-framed, single-stage reloader built around compound leverage and a long-stroke mechanism, which means smooth operation whether you're running low or high brass hulls. MEC has been building these in Wisconsin for decades, and the Sizemaster sits right in the sweet spot between a basic single-stage and a progressive press.
What Makes the Sizemaster .410 Tick
The heart of this press is the Power Ring collet re-sizer. It wraps around the shell base and squeezes it back to factory specifications, so your reloads chamber as cleanly as new ammo. The resizing station handles both brass and steel heads, high or low base, and the adjustable rammer tube lets you dial in seating pressure. Up top you get a flip-top powder measure that keeps your workflow quick and tidy between pulls.
Crimps That Look Factory
The cam-operated crimp system paired with MEC's Spindex2 crimp starters is where this press really earns its keep. The Spindex2 starters self-align to the original fold lines on your hull, so you get clean, consistent crimps round after round instead of wrinkled or off-center folds. It's set up to handle paper and plastic hulls, field loads, and both 2 and 3 inch shells.
Built for Steady .410 Sessions
The Sizemaster is ambidextrous, so lefties and righties both get a comfortable pull, and it runs at a realistic four to six boxes an hour once you find your rhythm. For .410, it ships with the 1/2 oz charge bar and the #10, #11, and #12 powder bushings to cover common loads right out of the box. Worth noting: unlike the larger-gauge Sizemasters, the .410 model does not come with the E-Z Prime auto primer feed, so you'll prime by hand on this one. It's a proven, serviceable setup for anyone who wants to keep feeding a .410 without emptying the wallet on factory shells.
Key Specifications
- Manufacturer: MEC (Mayville Engineering Co.)
- Manufacturer Part Number: 8120410
- UPC: 098489011105
- Model: Sizemaster
- Caliber/Gauge: .410 Bore
- Press Type: Single Stage
- Frame Material: Steel
- Resizer: Power Ring Collet Re-Sizer
- Crimp System: Cam-Operated with Spindex2 Crimp Starters
- Charge Bar: 1/2 oz
- Powder Bushings: #10, #11, #12
- Shell Length: Adjustable for up to 3 inch shells
- Load Rate: Approximately 4 to 6 boxes per hour
- Operation: Ambidextrous
- Country of Origin: United States
- Length: 23.15 in
What’s Included
- MEC Sizemaster single-stage reloading press (.410 Bore)
- Power Ring collet re-sizer
- Spindex2 crimp starters
- 1/2 oz charge bar
- #10, #11, and #12 powder bushings
Frequently Asked Questions
Does the MEC Sizemaster .410 come with an automatic primer feed?
No, the .410 bore version of the Sizemaster does not include the E-Z Prime auto primer feed. That feature comes standard on the larger gauge models, but on the .410 you'll seat primers by hand. It's a small step that doesn't slow most folks down much once they get into a rhythm.
Can the Sizemaster load both 2 inch and 3 inch .410 shells?
Yes. The Sizemaster is factory set for standard shells and adjusts to handle 3 inch hulls, so you can run both lengths on the same press. It also works with paper and plastic hulls for field loads.
What bushings and charge bar come with the .410 Sizemaster?
The .410 bore model ships with a 1/2 oz charge bar and three powder bushings, #10, #11, and #12. That combination covers a good range of common .410 loads right out of the box. If your recipe calls for something different, additional MEC bushings are available.
Is the Sizemaster a good press for someone new to reloading .410?
It's a solid choice. As a single-stage press, the Sizemaster walks you through one step at a time, which makes it easy to learn and hard to rush. The Power Ring collet re-sizer and Spindex2 crimp starters help newer reloaders turn out consistent, factory-quality shells without a steep learning curve.


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