Lee Precision's Auto Drum powder measure is a popular choice among reloaders for its speed, accuracy, and affordability. This comprehensive guide dives deep into its features, benefits, drawbacks, and how to get the most out of this versatile reloading tool. We'll cover everything from setup and calibration to troubleshooting common issues, making you a Lee Auto Drum expert in no time.
Understanding the Lee Auto Drum Powder Measure
The Lee Auto Drum is a volumetric powder measure, meaning it measures powder by volume rather than weight. This makes it faster than a scale-based system, ideal for high-volume reloading. Its drum design allows for consistent powder throws, even with different powder types. However, it's crucial to understand that accuracy depends heavily on proper calibration and consistent technique. While faster, it's less precise than a scale.
Key Features of the Lee Auto Drum
- Large Capacity Drum: Holds a significant amount of powder, reducing the need for frequent refills.
- Adjustable Throw: Allows for precise adjustment of the powder charge weight.
- Simple Design: Relatively easy to understand and use, making it beginner-friendly.
- Affordable Price: A cost-effective option compared to many other powder measures.
- Durable Construction: Built to last, withstanding the rigors of consistent use.
Advantages of Using the Lee Auto Drum Powder Measure
- Speed: Significantly faster than weighing each charge individually. This is particularly beneficial for high-volume reloading sessions.
- Consistency (with proper calibration): Once calibrated correctly, the Auto Drum delivers consistent powder charges, minimizing variations.
- Ease of Use: The straightforward design and operation are appealing to both beginners and experienced reloaders.
- Cost-Effectiveness: The lower price point makes it an accessible option for those on a budget.
Disadvantages of Using the Lee Auto Drum Powder Measure
- Volumetric Measurement: Accuracy depends on powder flow characteristics and consistency. Changes in temperature or humidity can affect accuracy.
- Calibration Requirement: Requires careful calibration for each powder type to ensure accurate charges. Improper calibration can lead to dangerous under- or over-charges.
- Not Ideal for All Powders: Certain powders may flow poorly through the drum, impacting consistency.
- Limited Precision: Not as precise as a powder scale, making it unsuitable for applications requiring extreme accuracy (like precision rifle loading).
Setting Up and Calibrating Your Lee Auto Drum Powder Measure
Proper setup and calibration are crucial for achieving accurate and safe results with the Lee Auto Drum. This process involves several steps:
Step-by-Step Calibration Guide:
- Gather Supplies: You'll need the powder measure, a scale, a powder funnel, and the powder you intend to use.
- Choose a Starting Point: Consult Lee's loading data for your chosen powder and cartridge. This will give you a target charge weight.
- Initial Adjustment: Begin with the measure's adjustment mechanism set to a low throw. Start with 20% less than your target charge weight.
- Measure and Adjust: Dispense multiple charges (at least 10) and weigh each one on your scale. Calculate the average weight.
- Iterative Adjustment: Adjust the measure's throw based on the average weight. Increase or decrease the throw to get closer to your target weight. Repeat steps 4 and 5 until you achieve consistent throws within your desired accuracy range (usually +/- 0.1 grains).
Important Safety Note: Always double-check your powder charges using a scale before loading cartridges. This is crucial for safety and consistent performance.
Troubleshooting Common Problems
Even with careful calibration, issues can arise. Here's how to address some common problems:
| Problem | Possible Cause | Solution |
|---|---|---|
| Inconsistent Throws | Poor powder flow, improperly calibrated measure | Check powder flow, recalibrate the measure |
| Low Throws | Improper adjustment, worn parts | Adjust measure, check for wear, replace if necessary |
| Powder Bridges | Static electricity, improper powder handling | Use anti-static tools, handle powder carefully |
| Excessive Variation | Environmental conditions (temperature, humidity) | Recalibrate, control environmental factors |
Maintaining Your Lee Auto Drum
Regular maintenance is essential for optimal performance and longevity. This includes:
- Cleaning: Regularly clean the drum and dispensing mechanism to prevent powder buildup.
- Inspection: Periodically inspect for wear and tear on parts. Replace worn components as needed.
- Storage: Store the measure in a clean, dry place away from moisture and extreme temperatures.
Conclusion: Is the Lee Auto Drum Right For You?
The Lee Auto Drum powder measure offers a balance of speed, affordability, and reliability, making it a solid choice for many reloaders. However, its volumetric nature necessitates careful calibration and a mindful approach to reloading. If you prioritize speed and are comfortable with the need for precise calibration and using a scale as a double check, the Lee Auto Drum is a great option. If extreme accuracy is your top priority, consider a progressive press with a scale-based powder measure. Remember, safe and accurate reloading practices are paramount, regardless of the equipment used.