The Lee Auto Disc is a handy tool for reloaders, offering a quick and easy way to determine the correct powder charge for various cartridges. However, understanding how to properly interpret the Lee Auto Disc chart is crucial for safe and accurate reloading. This guide provides a comprehensive breakdown of the chart, its features, and how to use it effectively.
Understanding the Lee Auto Disc and its Chart
The Lee Auto Disc is a simple yet effective powder measure that uses interchangeable discs to dispense different powder charges. Each disc is calibrated for specific cartridges and powder types, ensuring consistent and accurate powder drops. The accompanying chart is the key to using the Auto Disc correctly. It lists various cartridges and the corresponding disc number and charge weight in grains.
Key Features of the Lee Auto Disc Chart:
- Cartridge Identification: The chart clearly lists various cartridges, often categorized by caliber and type (e.g., .308 Winchester, 9mm Luger).
- Disc Number: This indicates the specific Lee Auto Disc to use for a given cartridge and powder type. This is crucial for accurate measurement.
- Powder Charge Weight (Grains): The chart specifies the powder charge weight in grains for each cartridge and disc combination. This is the most critical piece of information for safe reloading.
- Powder Type: The chart often specifies the type of powder the charge weight is calibrated for (e.g., Hodgdon Titegroup, IMR 4895). Using the wrong powder with a specific disc can lead to dangerous over- or under-charges.
- Warnings & Disclaimers: Always pay close attention to any warnings or disclaimers provided on the chart or in the accompanying Lee Precision documentation.
How to Use the Lee Auto Disc Chart:
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Identify Your Cartridge: Begin by determining the exact cartridge you're reloading. Pay close attention to the case length and specifications as slight variations can affect powder charges.
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Select the Correct Powder: Choose a powder that is appropriate for your cartridge and intended use. Always consult reloading manuals or the manufacturer's data for recommended powder types and charge weights.
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Locate the Correct Disc Number: Using the chart, find your specific cartridge and the recommended powder type. Note the corresponding disc number.
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Verify the Powder Charge Weight: The chart indicates the powder charge weight in grains for your cartridge and selected disc. Double-check this information, as using an incorrect charge can be dangerous.
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Set Up the Auto Disc: Install the correct disc into the Lee Auto Disc and adjust as needed to ensure accurate dispensing of the specified charge weight.
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Always Double-Check: Before loading each round, visually inspect the powder charge in your case. Never assume the Auto Disc dispensed the correct charge.
Safety Precautions When Using the Lee Auto Disc and its Chart:
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Consult Reloading Manuals: Always refer to current reloading manuals published by reputable sources for recommended loads. The Lee Auto Disc chart should be considered a guide only. Never rely solely on the chart for determining safe and accurate powder charges.
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Start Low, Work Up: When experimenting with new powders or cartridges, start with the minimum recommended charge from a reputable source and gradually increase the charge in small increments, carefully observing the results.
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Use a Scale: While the Lee Auto Disc is accurate, it's highly recommended to use a powder scale to verify the powder charge dispensed by the Auto Disc, especially when beginning your reloading journey.
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Cleanliness is Key: Keep your equipment clean and free of debris to ensure accurate powder measurement.
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Proper Training: Proper reloading training is essential for safe and effective reloading.
By carefully following these steps and safety precautions, you can confidently use the Lee Auto Disc and its chart to efficiently and safely reload your ammunition. Remember, precision and safety are paramount in reloading, and always prioritize your safety and the safety of others.
