The Lee Auto Disc Powder Measure is a popular choice among reloaders for its simplicity, affordability, and accuracy. However, mastering its use requires understanding the Lee Auto Disc Powder Measure chart and how to properly interpret and utilize it. This guide will delve into the intricacies of the chart, offering tips and tricks for accurate powder dispensing. We'll also discuss troubleshooting common issues and maximizing your reloading experience with this versatile tool.
Understanding the Lee Auto Disc Powder Measure Chart
The heart of the Lee Auto Disc Powder Measure system lies in its interchangeable discs. Each disc has a specific hole size, determining the amount of powder dispensed per throw. The Lee Auto Disc Powder Measure chart provides a crucial link between the disc used and the resulting powder charge weight. This chart is not a generic guide; it's specific to the type of powder you're using. Different powders have varying densities, impacting the weight of the powder dispensed for the same disc size.
Why the chart is crucial: The chart accounts for the powder's unique properties, ensuring accurate and consistent powder charges. Ignoring this and relying on estimations can lead to dangerous over- or under-charges, potentially damaging your firearm or causing injury.
Deciphering the Chart: A Step-by-Step Guide
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Identify Your Powder: The first step is to locate the specific powder you intend to use on the chart. Lee's chart typically lists many common powders.
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Locate the Disc Number: Once you've found your powder, locate the column corresponding to the disc you've installed in your powder measure. Each disc is clearly numbered.
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Find the Charge Weight: The intersection of your powder type and disc number will show the approximate powder charge weight dispensed per throw. Remember that this is an approximation.
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Verification is Key: Always verify your powder charge weight using a scale. Never rely solely on the chart. The chart provides a starting point, but variations in powder flow and other factors can affect the actual dispensed weight.
Factors Influencing Powder Charge Weight
Several factors beyond the disc and powder type can affect the dispensed weight:
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Powder Condition: Powder that's too humid or clumpy will flow less consistently, affecting charge weight. Ensure your powder is dry and free-flowing.
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Temperature: Temperature fluctuations can also impact powder flow. Loading in a consistently temperature-controlled environment is ideal for best results.
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Measure Adjustment: Fine-tuning the powder measure's adjustment can increase or decrease the amount dispensed. The chart serves as a baseline, but minor adjustments might be necessary based on your scale readings.
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Disc Wear: Over time, discs can wear down, slightly altering the hole size and powder charge. Regularly inspect your discs and replace them if they appear worn.
Troubleshooting Common Problems
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Inconsistent Powder Throws: If your scale readings vary significantly from the chart, check for powder clumping, humidity, or disc wear. Ensure the powder measure is properly adjusted and the case is seated correctly.
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Powder Bridge Formation: Powder bridging can cause inconsistent throws. Light tapping on the powder measure or using a powder funnel can prevent this.
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Incorrect Disc Selection: Double-check that you've selected the correct disc for your desired powder charge. A simple error here can lead to significant inaccuracies.
Optimizing Your Lee Auto Disc Powder Measure
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Calibration is Crucial: Before each reloading session, calibrate your powder measure. Weigh multiple throws and adjust as needed to achieve consistent results.
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Use a Scale: Never skip the step of weighing every charge, regardless of your confidence in the chart and measure. A scale is an essential piece of reloading equipment that can prevent accidents.
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Regular Maintenance: Clean your powder measure regularly to prevent powder buildup and ensure smooth operation.
Case Study: Addressing Inconsistent Powder Charges
Let's say you're using IMR4895 powder and a #31 disc. The Lee Auto Disc Powder Measure chart shows an approximate charge weight of 45 grains. After weighing several throws, you find that the actual charge weight is consistently around 43 grains. This discrepancy could be due to humidity, powder clumping, or a slightly worn disc. Address these factors, carefully recalibrate the measure, and retest until consistent 45-grain charges are achieved.
Conclusion: Accurate Reloading with the Lee Auto Disc
The Lee Auto Disc Powder Measure chart is an indispensable tool for accurate reloading. However, it's essential to understand its limitations and use it in conjunction with a scale for verification. By following this guide and understanding the factors affecting powder charge weight, you can maximize the accuracy and safety of your reloading process with your Lee Auto Disc Powder Measure. Remember, safety and precision are paramount in reloading, so always double-check your work.