Lee Precision's Auto Disc powder measure is a popular choice among reloaders for its accuracy and ease of use. However, understanding and utilizing the Lee Auto Disc Powder Measure Chart is crucial for safe and consistent reloading. This comprehensive guide will delve into the intricacies of the chart, explaining how to interpret it, troubleshoot common issues, and ultimately maximize the potential of your Lee Auto Disc. This guide will cover everything from understanding the basics of the chart to advanced techniques for fine-tuning your powder throws.
Understanding the Lee Auto Disc Powder Measure Chart
The Lee Auto Disc Powder Measure Chart isn't just a table of numbers; it's a roadmap to accurate powder dispensing. The chart itself correlates the powder disc number with the powder charge weight for various calibers and powder types. It's imperative to understand that this chart provides starting points. You will always need to independently verify your powder throws using a scale. Never rely solely on the chart for your powder charges.
Deciphering the Chart's Data
The chart typically organizes data by powder type and caliber. You'll find a column for the disc number and its corresponding charge weight in grains. For example, you might see:
| Disc Number | .308 Winchester (Powder X) | .223 Remington (Powder Y) |
|---|---|---|
| 1 | 42.0 grains | 24.0 grains |
| 2 | 43.5 grains | 25.5 grains |
| 3 | 45.0 grains | 27.0 grains |
Important Considerations:
- Powder Type: The chart is specific to certain powders. Using the wrong powder with the indicated disc will result in inaccurate and potentially dangerous charges. Always double-check that you're using the correct powder type specified on the chart.
- Caliber: The charge weight will vary greatly depending on the cartridge caliber. Using the incorrect caliber data will lead to unsafe loads.
- Disc Number: This is the crucial identifier for your powder measure's setting. Ensure you have the correct disc installed before proceeding.
- Variations: Powder characteristics can vary slightly between batches. Always independently verify your powder throws, even with an established disc setting.
Setting Up Your Lee Auto Disc: A Step-by-Step Guide
- Choose the Right Disc: Select the appropriate disc based on the desired charge weight and the powder you are using. Consult the Lee Auto Disc Powder Measure Chart to make the correct selection.
- Install the Disc: Insert the disc into the powder measure, ensuring it's securely seated. Consult your Lee Auto Disc manual for specific instructions.
- Initial Throw Verification: Make a few throws and weigh each charge on a powder scale. This will give you a baseline to determine if any adjustments are needed.
- Adjustments: If the throws aren't within your desired tolerance (typically +/- 0.1 grains), make adjustments to the powder measure's settings. This often involves slightly turning the adjustment screw. Remember to re-weigh several throws after each adjustment.
- Consistency Check: Continue testing and adjusting until you achieve consistent charge weights. Remember that minor variations are normal.
Troubleshooting Common Issues with the Lee Auto Disc Powder Measure
- Inconsistent Throws: This is often due to improper disc installation, static electricity, or clumps in the powder. Check your disc installation, use an anti-static powder funnel, and ensure your powder is free-flowing.
- Low Throws: This might indicate that the adjustment screw needs to be tightened slightly or that the disc is worn.
- High Throws: This usually means the adjustment screw needs to be loosened.
- Double Charges: Ensure the powder measure mechanism is functioning properly, clean the measure thoroughly, and check for any obstructions.
Safety Precautions: Absolutely Essential for Reloading
- Always use a scale: Never rely solely on the chart or the powder measure's throw. Always independently weigh your powder charges.
- Follow the manufacturer's instructions: Carefully read and understand all instructions before using the Lee Auto Disc or any reloading equipment.
- Cleanliness is key: Regularly clean your powder measure to prevent build-up and ensure accurate throws.
- Proper storage: Store your powder in a cool, dry location away from ignition sources.
Conclusion: Mastering Your Lee Auto Disc
The Lee Auto Disc Powder Measure Chart is a valuable tool, but it's only one piece of the puzzle. Understanding its limitations, consistently verifying your powder throws with a scale, and adhering to strict safety procedures are vital for successful and safe reloading. By mastering your Lee Auto Disc, you'll be able to produce precise and consistent loads, improving the accuracy and reliability of your handloads. Remember, reloading is a meticulous process that demands attention to detail and a commitment to safety. Always double-check your work and never compromise safety.