Description
Big-bore 10 gauge ammo gets expensive fast, and factory loads can be tough to find when you need them. The MEC 600 Jr. Mark 5 puts that control back in your hands. This is MEC's most popular single stage model, and it earns that reputation by doing every part of the reloading process on a single cast frame: depriming, priming, resizing the base, dropping powder, seating the wad column, measuring shot, and forming a clean crimp. Once you get a rhythm going, it'll turn out roughly eight to ten boxes an hour, which is plenty for a day in the duck blind or at the goose field.
What Sets the 600 Jr. Mark 5 Apart
The cam-action crimp die returns each shell to its original condition, so your reloads feed and chamber like factory ammo. The one-piece Spindex crimp starter swivels to line up with the shell's existing creases, giving you a tight, consistent crimp every time. There's a resizing station that handles the base to bring it back to spec, plus the Pro-Check system that keeps the charge bar in proper sequence so you don't spill powder or shot. The Adjusta-Guide wad feed makes dropping wads quick and painless.
Set Up for 10 Gauge 3-1/2" Shells
This particular model comes configured for 10 gauge 3-1/2" hulls and ships with a 2 oz. charge bar along with powder bushings 37, 40, and 44. The press mounts solidly to your bench through four mounting holes and includes a built-in primer feed. If you want to speed things up down the road, it'll accept the optional MEC 285 CA EZ Prime auto primer feed, so you're not handling each primer by hand.
Built to Last on the Bench
MEC has been building reloading gear in America for decades, and these presses have a reputation for running for years with basic upkeep. Die sets are available in other gauges if you ever want to convert it, making this a flexible anchor for any shotshell reloading setup.
Key Specifications
- Manufacturer: MEC
- Model: 600 Jr. Mark 5
- Manufacturer Part Number: 844710
- UPC: 098489012881
- Gauge: 10 Gauge
- Shell Length: 3-1/2"
- Press Type: Single Stage
- Priming Feature: Built-in (upgradable to 285 CA auto primer feed)
- Charge Bar: 2 oz. (lead shot)
- Powder Bushings Included: 37, 40, 44
- Loading Rate: 8 to 10 boxes per hour
- Crimp Starter: One-piece Spindex, 6 or 8 point
- Mounting Holes: 4
- Gauge Conversions: Available (die sets sold separately)
- Length: 23.2"
What’s Included
- MEC 600 Jr. Mark 5 single stage shotshell press (10 gauge)
- 2 oz. charge bar
- Powder bushings 37, 40, and 44
- Instruction manual
Frequently Asked Questions
How many shells can the MEC 600 Jr. Mark 5 load per hour?
Once you've got a steady rhythm, the 600 Jr. Mark 5 will turn out about eight to ten boxes of shells per hour. It's a single stage press, so you move each hull through the stations yourself, but the layout keeps every step quick and smooth. That pace is plenty for keeping a 10 gauge waterfowl hunter stocked up.
Does this 10 gauge model come set up for 3-1/2" shells?
Yes, this version arrives configured for 10 gauge 3-1/2" hulls right out of the box. It ships with the 2 oz. charge bar and powder bushings 37, 40, and 44 for that gauge. You just mount it to your bench and dial in your load.
Can I add an automatic primer feed to the 600 Jr. Mark 5?
Absolutely. The press has a built-in primer feed, but it's designed to accept the optional MEC 285 CA EZ Prime auto primer feed. Adding it means you no longer have to handle each primer individually, which speeds things up and keeps your hands cleaner.
Can I use this press for other gauges later?
The 600 Jr. Mark 5 is gauge-convertible, so you can switch it to another gauge by purchasing the appropriate die set. Keep in mind the press itself is built around the 10 gauge frame, so most folks pick the gauge that matches the shotgun they shoot most. Die sets are sold separately.




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