The Lee Auto Disk Powder Measure is a popular choice for reloaders due to its simplicity, affordability, and accuracy. However, mastering its use requires understanding how to interpret the Lee Auto Disk Powder Measure chart and properly adjust it for different powder types and calibers. This guide will provide a comprehensive overview of the chart, its usage, and tips for achieving consistent, safe powder charges.
Understanding the Lee Auto Disk Powder Measure Chart
The heart of the Lee Auto Disk system lies in its interchangeable disks. Each disk is designed with a specific hole size, dictating the volume of powder dispensed per throw. The Lee Auto Disk Powder Measure chart, often included with the measure or found on Lee Precision's website, translates these disk sizes into powder charges for various calibers and powder types. Crucially, the chart provides approximate powder charges, and you should always double-check your results with a scale.
Key Elements of the Chart:
- Disk Number: This clearly indicates the specific disk being used. Each disk has a unique number for easy identification.
- Caliber: The chart lists various calibers, indicating the cartridge for which the powder charge is intended.
- Powder Type: The chart often categorizes powders by their type (e.g., ball, flake, extruded) and manufacturer. This is vital because different powder types have varying densities and flow characteristics, directly impacting the accuracy of the measure.
- Powder Charge (Grains): This is the approximate amount of powder dispensed per throw using the specified disk. This is the critical piece of information and is what you'll use to guide your reloading process. Remember, this is an approximation and should always be verified.
- Notes/Warnings: The chart might include additional notes, such as warnings about using certain disks with specific powders or calibers. Pay close attention to these cautionary statements.
Using the Lee Auto Disk Powder Measure Chart Effectively:
- Identify Your Components: Determine the specific Lee Auto Disk and the disk number you're using.
- Locate the Correct Section: Find the correct section of the chart for your chosen caliber and powder type.
- Determine the Appropriate Charge: Find the corresponding approximate powder charge (in grains) for your chosen disk.
- Verify with a Scale: This is the most crucial step. Regardless of the chart's indication, always weigh your charges using a reliable powder scale. This ensures consistency and safety. Never rely solely on the chart for precise powder charges.
- Adjust as Needed: If the weighed charge consistently differs from the chart's indication, you might need to adjust the measure's settings or consider a different disk.
Tips for Accurate Measurement:
- Consistent Powder Flow: Ensure your powder flows freely. Clumping or bridging can lead to inaccurate charges.
- Proper Measure Setup: Follow Lee Precision's instructions for proper measure setup and operation. Incorrect setup can drastically affect accuracy.
- Environmental Conditions: Temperature and humidity can influence powder flow. Consider these factors when measuring.
- Regular Cleaning: Keep your measure clean and free of powder residue. Build-up can impede proper operation.
- Start Low, Work Up: When experimenting with a new powder and disk combination, always start with a slightly lower charge than indicated on the chart and gradually increase it while carefully weighing each charge on your scale.
Safety First: Always Double-Check Your Reloading!
The Lee Auto Disk Powder Measure chart is a valuable tool, but it's crucial to remember that it only provides approximate values. Always weigh your charges on a scale to ensure accuracy and safety. Improperly loaded ammunition can lead to dangerous malfunctions. Consult reputable reloading manuals for complete and accurate loading data specific to your chosen cartridge and powder. Consistent accuracy and careful adherence to safety protocols are paramount in reloading.
