Description
The MEC 5/8 oz Single Stage Lead Shot Charge Bar is the part that meters your shot on a MEC single stage reloader. It sets the shot side of the equation at a fixed 5/8 ounce drop, while a removable powder bushing (sold separately) handles the powder side. That split lets you dial in a recipe by choosing the bushing that matches your powder, and it's the standard way MEC single stage presses have loaded shells for decades.
Where This 5/8 oz Charge Bar Fits
This is a 302 series bar, which means it works across MEC's single stage lineup including the 600 Jr Mark 5, Sizemaster, and other single stage machines. Keep in mind that lead and steel shot bars are not interchangeable, so this one is strictly for lead. If you already run a single stage MEC and want to load a lighter 5/8 oz payload for lighter recoiling target or small gauge loads, this bar drops right in.
Anodized Build and the Soft Insert
MEC machines these bars from anodized aluminum, so they hold up to years of use without wearing loose. The bar also comes with a soft insert designed to keep larger or harder lead shot from shearing as the bar cycles. That insert does double duty, since MEC notes it removes the need for a grommet under the shot bottle. If the insert ever wears out down the road, it's a replaceable part.
Getting Accurate Drops
One thing worth knowing is that charge bars meter shot by volume, not by weight, so the stamped 5/8 oz figure is a guideline rather than a guarantee. Shot density and pellet size shift the actual drop a little, and the same goes for powder bushings versus the published chart. The move here is to run a few drops across a good powder scale when you set up, then trust the bar once you confirm what it's throwing. After a couple checks you'll know exactly what your press is doing every pull of the handle.
Key Specifications
- Manufacturer: MEC Reloading (Mayville Engineering)
- Manufacturer Part Number: 30258
- Series: 302 Single Stage
- Shot Charge Weight: 5/8 oz
- Shot Type: Lead
- Press Type: Single Stage
- Compatible Presses: MEC 600 Jr Mark 5, Sizemaster, and other single stage models
- Material: Anodized aluminum
- Metering: Volumetric (fixed shot drop)
- Powder Bushing: Accepts removable MEC powder bushings (sold separately)
- Soft Insert: Included, replaceable Part #8440
- UPC: 098489014823
What’s Included
- MEC 5/8 oz single stage lead shot charge bar (302 series)
- Soft shot insert (installed)
Frequently Asked Questions
Which MEC presses does this 5/8 oz charge bar fit?
It's a 302 series single stage bar, so it works in MEC single stage presses like the 600 Jr Mark 5 and Sizemaster. It won't work in progressive machines, which use a different bar series. If your press is a single stage MEC, this one drops right in.
Do I need a powder bushing to use the charge bar?
Yes. The charge bar meters the shot at 5/8 oz, and a separate removable powder bushing sets the powder charge. The bushing is sold separately, and you pick one based on the powder and recipe you're loading.
Will the charge bar drop exactly 5/8 ounce of shot?
The bar meters by volume rather than weight, so the stamped 5/8 oz is a close guideline. Actual drop shifts slightly with shot size and density, which is why it's smart to verify a few drops on a powder scale during setup. Once you confirm the weight, you'll know what your press throws every stroke.
Can I use this bar for steel shot?
No, this is a lead shot bar only. MEC makes separate steel shot charge bars because lead and steel are not interchangeable. Running steel through a lead bar can damage components, so match the bar to your shot type.





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