For reloaders using MEC presses, understanding the powder bushing chart is paramount for consistent and safe ammunition production. This guide delves into the intricacies of MEC powder bushings, explaining how they work, how to choose the right one, and how to interpret the chart itself. We'll also address common questions and troubleshooting tips to ensure your reloading experience is both successful and safe.
Understanding MEC Powder Bushings
MEC progressive reloading presses utilize powder bushings to accurately meter powder charges into your shotgun shells. These bushings are precisely manufactured with different sized orifices, each delivering a specific powder charge weight. The chart correlates the bushing size with the corresponding powder weight for various shotgun powders. Crucially, the bushing size and powder weight relationship is specific to the powder type. Using the wrong bushing or the wrong chart can lead to dangerous overcharges or undercharges, resulting in malfunctioning ammunition and potential injury.
How Powder Bushings Work
The powder bushing acts as a restrictor, controlling the flow of powder from the hopper to the shell. The size of the orifice determines the amount of powder that can pass through during a single press cycle. The press's mechanism then drops this metered charge into the shell, ready for the primer and shot.
Deciphering the MEC Powder Bushing Chart
The MEC powder bushing chart is organized typically by powder type and bushing size. You'll find columns listing the bushing size (usually a number) and rows specifying the expected powder charge weight in grains. Always refer to the chart specific to the powder you are using. Mixing charts can be dangerous.
Example Chart Section (Illustrative - Not Actual Data):
| Bushing Size | Clays (grains) | Unique (grains) | Red Dot (grains) |
|---|---|---|---|
| 28 | 18.0 | 19.5 | 17.0 |
| 29 | 18.5 | 20.0 | 17.5 |
| 30 | 19.0 | 20.5 | 18.0 |
Important Considerations:
- Powder Type: This is the most critical element. A bushing size yielding 18 grains of Clays will not yield the same weight of Unique or Red Dot.
- Bushing Size: Smaller numbers generally correspond to smaller powder charges.
- Temperature and Humidity: These environmental factors can slightly affect powder flow and charge weight.
- Powder Condition: Lumpy or caked powder can lead to inconsistent charges. Always ensure your powder is properly stored and free-flowing.
Selecting the Right Bushing
To choose the correct bushing, determine your desired powder charge based on your reloading recipe. Then, find that charge weight on the chart for your specific powder. The corresponding bushing size is the one you should use. Always double-check your work and verify the data with your reloading manual.
Troubleshooting Common Issues
- Inconsistent Charges: This might indicate a problem with your powder, a clogged bushing, or even a problem with the press itself.
- Incorrect Charges: Verify the bushing size against the chart for your specific powder. Recheck your measurements and ensure your press is properly adjusted.
- Missing Charges: This could result from insufficient powder in the hopper, a blockage in the powder path, or a problem with the press's metering mechanism.
Safety First
Reloading is inherently dangerous. Always prioritize safety:
- Follow the reloading manual instructions precisely.
- Use the correct powder bushing for your selected powder and desired charge weight.
- Never mix powder types or charts.
- Always double-check your work.
- Wear appropriate safety glasses and hearing protection.
By understanding and properly utilizing the MEC powder bushing chart, you can ensure accurate and safe reloading of your shotgun ammunition. Remember, precise powder charges are essential for reliable and safe firearm function. Consistent adherence to the manufacturer's guidelines and attention to detail will significantly reduce the risks associated with reloading.
