Description
The MEC 600 Jr. Mark V is the world's most popular single-stage shotshell reloader, and this version is built specifically for the .410 bore. Factory set for 3" shells and adjustable down to 2-1/2", it walks your hull through every step of the process on one machine. One pull of the handle deprimes, reprimes, resizes the base, drops powder, seats the wad, measures the shot charge, and starts the crimp. No transfer die, no separate stations to fuss with, just a smooth sequence from empty hull to finished round.
What Sets the 600 Jr. Mark V Apart
This press earns its reputation through smart details that make reloading repeatable. The one-piece Spindex crimp starter rides on a swivel so it finds the original fold lines on your hull, giving you clean six-point crimps shell after shell. The cam-action crimp die brings each shell back to its original shape, while the Adjusta-Guide wad feed lets you drop wads in fast with vertical adjustment. The Pro-Check keeps the charge bar in proper sequence so you avoid spilled powder or shot, and the wad pressure and height indicators let you keep an eye on your loads as you go.
Loading .410 With the Mark V
This .410 setup comes ready to run with a 11/16 oz charge bar and #10, #11, and #12 powder bushings, covering a solid range of common small-bore recipes. Expect to turn out somewhere in the neighborhood of four to six boxes an hour at a comfortable pace, which is plenty for keeping up with skeet practice, small game loads, or just feeding a .410 that factory ammo prices have gotten rough on. Die sets are sold separately if you ever want to convert the press to another gauge down the road.
Built to Outlast You
The 600 Jr. design has been around since the 1950s, and folks still run presses from the '60s and '70s today. It's an affordable way into shotshell reloading that beginners pick up quickly thanks to clearly written instructions, yet it has enough adjustability to satisfy experienced hands. Give it a spot on the bench and it'll crank out quality .410 shells for decades.
Key Specifications
- Manufacturer: MEC
- Model: 600 Jr. Mark V
- Manufacturer Part Number: 84474103
- UPC: 098489018197
- Gauge: .410 Bore
- Shell Length: 3" (adjustable to 2-1/2")
- Press Type: Single Stage
- Charge Bar: 11/16 oz
- Powder Bushings: #10, #11, #12
- Crimp Starter: One-piece Spindex, 6-point
- Priming: Built-in
- Loading Rate: Approx. 4 to 6 boxes per hour
- Country of Origin: United States
- Length: 23.45"
What’s Included
- MEC 600 Jr. Mark V single-stage press (.410 bore)
- 11/16 oz charge bar
- Powder bushings #10, #11, and #12
- Operating manual
Frequently Asked Questions
What shell lengths does the .410 Mark V handle?
This press comes factory set for 3" .410 shells and adjusts down to 2-1/2". That covers the two most common .410 hull lengths, so you can load for skeet, small game, or general plinking without swapping hardware.
Does the 600 Jr. Mark V resize the shell base?
Yes. The press resizes the metal base as part of its single-stage sequence, returning the head to proper dimensions. Combined with the cam-action crimp die that reforms the shell, you get rounds that chamber and feed like factory ammo.
Can I add a primer feed to this .410 press?
On most gauges the 600 Jr. Mark V can be upgraded with the E-Z Prime 285 CA automatic primer feed, but that upgrade is not available for the .410 bore version. This press uses the built-in priming station, where you seat primers as part of the normal cycle.
Is the MEC 600 Jr. Mark V good for a first-time reloader?
It's one of the most recommended starting points for shotshell reloading. The instructions are clearly written, the single-pull operation is easy to learn, and it still has enough adjustment at the wad and crimp stations to keep experienced reloaders happy. Many owners run the same press for decades.




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