Lee Precision's Auto Disc powder measure is a popular choice among reloaders for its accuracy and ease of use. Understanding the Lee Auto Disc Powder Measure Chart is crucial for safe and consistent reloading. This guide will walk you through interpreting the chart, troubleshooting common issues, and maximizing the accuracy of your Lee powder measure. We'll cover everything from setting up your measure to dealing with different powder types and ensuring consistent charges.
Understanding Your Lee Auto Disc Powder Measure Chart
The heart of accurate reloading with a Lee Auto Disc lies in correctly interpreting the chart provided with your measure. This chart lists the different throw charges for various powder types and disc sizes. Accurate powder charges are paramount for safety and consistent performance. Improper charges can lead to dangerous pressure spikes or underpowered rounds.
Key Elements of the Lee Auto Disc Powder Measure Chart:
- Powder Type: The chart will list several common powders by name (e.g., Hodgdon Titegroup, IMR4895, etc.). It's crucial to find your powder on the chart. Using the wrong data is dangerous.
- Disc Size: Lee Auto Disc measures come with a variety of interchangeable discs, each marked with a number or letter. This number indicates the powder charge capacity. Choosing the correct disc for your powder and desired charge is critical.
- Powder Charge (Grains): The chart provides the approximate powder charge weight (in grains) that each disc will throw for each listed powder. These values are generally averages, and you should always verify your charges with a scale. Never rely solely on the chart for critical measurements.
- Throw Consistency: While the chart gives an average, the actual throw can vary slightly. This variance is acceptable, but significant inconsistencies may indicate a problem with the measure or a poorly flowing powder.
Example Chart Entry: (Note: This is a hypothetical example, always consult your actual chart)
| Powder Type | Disc Size | Charge (Grains) |
|---|---|---|
| Hodgdon Titegroup | #1 | 4.0 |
| IMR4895 | #1 | 5.5 |
| Accurate #2 | #2 | 6.0 |
This hypothetical example shows that with the #1 disc, Titegroup should throw approximately 4.0 grains, while IMR4895 throws around 5.5 grains. However, remember these are approximate values.
How to Use the Chart:
- Identify your powder: Find the specific type of powder you are using on the chart.
- Determine desired charge: Consult your reloading manual to determine the correct powder charge for your specific cartridge and load.
- Select the correct disc: Choose the disc size from the chart that will throw a charge close to your desired amount. You may need to experiment with different discs.
- Verify with a scale: Always weigh your powder charges on a reloading scale to confirm accuracy. Do not skip this step! This verifies the chart and your setup.
Troubleshooting Common Issues with the Lee Auto Disc
Even with a well-maintained measure and accurate charts, problems can arise.
Problem: Inconsistent powder charges.
Solution:
- Check for debris: Clean the measure thoroughly.
- Inspect the disc: Ensure the disc is properly seated and not damaged.
- Powder flow: Check the powder flow. Clumping can cause inconsistencies.
- Measure condition: Verify proper operation and lubrication.
- Scale calibration: Double-check your scale's calibration.
Problem: Powder bridging in the measure.
Solution:
- Powder type: Switch to a free-flowing powder.
- Measure adjustment: Fine-tune the measure's adjustment screw for optimal flow.
- Temperature and humidity: Consider environmental conditions.
Problem: The measure throws too much or too little powder.
Solution:
- Disc Selection: Select a different disc based on the chart.
- Measure Adjustment: Use the adjustment screw to increase or decrease the powder charge. Start with small adjustments to avoid errors.
Maximizing Accuracy with Your Lee Auto Disc
To obtain the highest accuracy, consider these additional points:
- Powder type: Some powders flow better than others. The smoother the flow, the more consistent the charge will be.
- Measure maintenance: Regular cleaning and lubrication are critical.
- Environmental factors: Temperature and humidity can affect powder flow.
- Scale calibration: Regularly calibrate your scale to ensure accuracy.
- Consistent technique: Develop a consistent reloading technique to minimize variables. Avoid shaking the measure.
- Practice: Consistent practice improves your technique and understanding of your equipment.
Safety First: A Final Word on Reloading
Reloading is a rewarding hobby, but it's crucial to prioritize safety. Always follow your reloading manual, weigh every charge, and never use a reloaded cartridge if you suspect an error. The information in this guide is supplemental and should not replace the instructions and warnings in your reloading manual. Improper reloading practices can lead to serious injury or death. Always double-check your work.