What is the Lee Auto Disc Powder Measure?
Description and Advantages
The Lee Auto Disc Powder Measure is a popular choice for reloaders, particularly those starting out, and for those seeking an affordable, efficient way to dispense propellant. This powder measure’s simple design makes it remarkably easy to use and maintain. The measure itself consists of a body, which attaches to a reloading press, and a series of interchangeable discs. These discs, with varying sized holes, allow for the precise metering of different powder types. Powder is poured into a hopper, and as the press ram moves up and down, the measure dispenses a pre-determined amount of powder into the case.
Its affordability is a significant draw. Compared to more complex and expensive powder measures, the Lee Auto Disc is a budget-friendly option that still delivers reliable performance. Furthermore, the Lee Auto Disc is known for its speed. The automated dispensing process allows reloaders to charge cases quickly, making it ideal for high-volume reloading sessions. The ease of use is another key advantage. The setup is straightforward, and the interchangeable discs make it easy to switch between different powder types and desired charge weights.
Disadvantages and Considerations
However, the Lee Auto Disc isn’t without its limitations. Some reloaders find that the dispensing of certain powder types, especially fine-grained powders, can be inconsistent. This can sometimes lead to slight variations in the powder charge, which can affect accuracy. Another consideration is the potential for powder “bridging,” where grains of powder can become lodged in the disc, preventing the full charge from being dispensed. Regular maintenance and attention to technique help mitigate these issues.
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Understanding the Chart’s Purpose
The Lee Auto Disc Chart is the essential companion to the Lee Auto Disc Powder Measure. This handy reference is designed to simplify the process of determining the correct disc number to use for a given powder and bullet combination. It provides a valuable starting point for any reloader, saving time and effort in the initial setup phase. It helps determine the estimated powder charge needed for various combinations.
Essentially, the chart is a compilation of data generated through extensive testing by Lee Precision. This data is based on the use of the Lee Auto Disc Powder Measure with different powders and bullets. The information presented on the chart provides a practical guide for setting up your powder measure. The chart offers suggested disc sizes to start with for various combinations.
Limitations and Guidance
The chart’s data isn’t a universal rule. Every reloading setup is unique. The chart is meant to provide a starting point, not a final solution. Variations in reloading equipment, such as the case’s internal capacity and the individual reloading press, can affect the optimal charge weight. Always treat the data as a guide, and then work up a load while consulting your reloading manual.
You’ll usually find the Lee Auto Disc Chart included with your Lee Auto Disc Powder Measure. If you happen to misplace the chart, it is available for download on the Lee Precision website. This online accessibility ensures that the chart is always available, even if the physical version is missing.
Decoding the Chart Layout
Understanding the chart’s layout is key to unlocking its value. The format is organized for quick and easy reference. It typically lists the various powders tested. Alongside each powder, you’ll find columns displaying the different bullet weights and types that were used in testing. Each bullet weight and type will have a corresponding disc number. This number indicates the size of the disc to be used with the Lee Auto Disc Powder Measure to dispense the approximate charge weight. You’ll also find estimated powder charge values.
The chart is designed to be simple, which lets you quickly find the relevant information for your reloading needs. Knowing how to navigate the chart is critical to streamlining your reloading process. By using the chart efficiently, reloaders save time and minimize the guesswork involved in initial powder measure settings.
Navigating the Lee Auto Disc Chart: Practical Steps
Using the Lee Auto Disc Chart is straightforward, but it’s important to follow the steps carefully for consistent and safe results.
Step-by-Step Guide
Begin by identifying your chosen powder type. Refer to the powder manufacturer’s information, or your reloading manual, to ensure compatibility with your selected cartridge and bullet. The chart will organize data according to different powder types.
Next, identify your bullet’s weight and type. The chart lists various bullet weights and constructions, such as FMJ (Full Metal Jacket), HP (Hollow Point), or lead. Cross-reference this information with the bullet you are using. If your bullet is not listed, it’s crucial to consult a reloading manual.
Once you have identified the powder and bullet, locate the corresponding disc number listed on the chart. This number signifies the correct disc to install in your Lee Auto Disc Powder Measure.
After installing the recommended disc, set up the powder measure on your reloading press. Dispense a few charges into a scale. Check the weight of these powder charges using a calibrated scale. This step is non-negotiable for safe reloading. Confirm that the powder charge is within acceptable limits, and adjust as needed.
Important Considerations for Reloading Safely
Reloading is a rewarding hobby, but it requires unwavering attention to safety. The Lee Auto Disc Chart is a helpful tool, but it does not replace the fundamental safety precautions needed for reloading. Always treat every step with precision and care.
Essential Safety Precautions
Always consult a reputable reloading manual, such as the ones published by Lyman, Hornady, or Speer, for specific load data for your chosen cartridge, powder, and bullet combination. The manual provides a wealth of information. This is critical for ensuring safe pressures. Always begin with the minimum recommended charge weight, and work your way up cautiously, while carefully monitoring signs of excessive pressure.
Never exceed the maximum load listed in your reloading manual. Overcharging can lead to dangerous pressures that may cause the firearm to malfunction, leading to serious injury. A chronograph is a valuable tool for monitoring velocity, and it allows you to ensure that your loads are within safe parameters.
Before you begin reloading, thoroughly inspect your brass cases for any damage, such as cracks or dents. Proper case preparation, including resizing, trimming, and deburring, is essential for consistent performance and safety. Clean primers and use the correct type and size primer for your cartridge.
Always wear appropriate safety glasses and consider using gloves when handling reloading components, especially primers and powders. Reload in a well-ventilated area to minimize exposure to potential fumes. Ensure your work surface is clean and free of distractions. Be methodical, and double-check your steps to prevent mistakes.
Applying the Chart: Reloading Practical Examples
Let’s look at some practical examples to illustrate how to use the Lee Auto Disc Chart.
Practical Reloading Scenarios
Consider reloading .38 Special cartridges with a 158-grain lead round nose bullet, and you have Hodgdon HP-38 powder. First, find Hodgdon HP-38 in the Lee Auto Disc Chart. Then locate the 158-grain bullet data. This shows the suggested disc number to get a starting point. Double check the data in your reloading manual. Weigh several charges with the disc to ensure it dispenses consistently. Make adjustments to the powder measure, and then work up the load slowly, consulting the manual.
Another example is reloading .223 Remington rounds with a 55-grain FMJ bullet, and you’re using IMR 4064 powder. Locate IMR 4064 on the Lee Auto Disc Chart. Find the data for the 55-grain bullet. Take the provided disc number from the Lee Auto Disc Chart as a starting point and adjust for your press. Use this as a starting point, checking and double-checking all the data in your reloading manual.
By working through these examples, you can see how the Lee Auto Disc Chart provides guidance. Always compare with your reloading manual for safe, precise reloading. The chart saves time, and it’s a valuable asset.
Troubleshooting Common Issues
Even with a well-set-up system, reloaders can encounter some common issues. Troubleshooting these problems requires understanding the potential causes and using systematic solutions.
Powder Related Concerns
Powder bridging is a frequent concern, particularly with stick powders. This occurs when grains of powder get caught in the disc, preventing the full charge from dispensing. To prevent bridging, ensure the powder is flowing freely into the hopper, and that the measure is set up correctly. You can tap the measure gently to encourage powder flow.
Inconsistent powder charges are another issue that can affect accuracy. A few common causes can include static build-up, worn or damaged components, and variations in the powder itself. Grounding the powder measure can help to prevent static. Inspecting the measure for wear, and replacing any suspect parts is essential. A calibrated scale is critical for confirming that charges are consistent.
Conclusion: Harnessing the Power of the Lee Auto Disc Chart
The Lee Auto Disc Chart, combined with the Lee Auto Disc Powder Measure, forms a powerful combination for efficient reloading. The chart provides a solid framework for setting up your powder measure, saving time and helping reloaders quickly get to the next step.
Final Thoughts
Remember that the chart is a starting point. Reloading safety is paramount. Always rely on the reloading manuals for data, and never exceed the recommended loads. Employing best practices ensures a safe and enjoyable reloading experience.
Other useful tools to consider include a good quality reloading scale, calipers for measuring case lengths, and a case trimmer for consistent case preparation.
Are you ready to improve your reloading? Take your reloading to the next level. Grab your Lee Auto Disc Chart, your reloading manual, and start loading today. With attention to detail, and the proper application of the Lee Auto Disc Chart, you can begin to fine-tune your loads. The result is shooting with greater accuracy.
