Lee Precision's Auto Disk Powder Measure is a popular choice among reloaders, offering a balance of accuracy, speed, and affordability. This comprehensive guide delves into the intricacies of this powder measure, providing tips, tricks, and troubleshooting advice to help you achieve consistent and safe reloading results. We'll cover everything from setup and calibration to common issues and advanced techniques.
Understanding the Lee Auto Disk Powder Measure's Mechanism
The Lee Auto Disk Powder Measure uses a unique system of interchangeable disks to dispense powder charges. These disks feature precisely sized holes that determine the amount of powder delivered with each throw. The measure's operation relies on the throw-and-catch mechanism: a rotating cam pushes a disc which draws powder into a cavity, then releases it into the case. This system is remarkably simple yet surprisingly precise when properly calibrated and maintained.
Key Components and Their Functions
- Powder Hopper: Holds the powder supply. Ensure it's clean and free of debris for consistent metering.
- Powder Disk: The heart of the system. Choose the correct disk for your desired powder charge weight.
- Micrometer Adjustment: Allows for fine-tuning the powder charge weight. Small adjustments can significantly impact accuracy.
- Throw Arm: This mechanism throws the powder from the metering cavity into the case.
Setting Up Your Lee Auto Disk Powder Measure
Proper setup is crucial for accurate and safe powder dispensing. Here's a step-by-step guide:
Step 1: Selecting the Correct Powder Disk
Lee provides a comprehensive chart matching their powder disks to various powder types and charge weights. Incorrect disk selection is a major source of inaccuracy. Consult this chart carefully.
Step 2: Mounting the Measure to Your Press
Securely mount the powder measure to your reloading press. Improper mounting can lead to inconsistent powder drops and even damage to the equipment. Follow Lee's instructions precisely.
Step 3: Initial Calibration
Begin with a preliminary calibration using a scale. Dispense several charges and adjust the micrometer until you consistently achieve your target weight. This requires patience and meticulous attention to detail.
Step 4: Fine-Tuning the Calibration
Once you have a reasonably close weight, further refine your calibration by dispensing several more charges and making minute adjustments as needed. Remember that small adjustments can have a big impact.
Advanced Techniques for Enhanced Accuracy
Using a Case Activation System
Many reloaders pair the Lee Auto Disk with a case activation system which ensures a consistent powder drop every time a case is placed under the powder dispensing mechanism. This significantly improves the speed and consistency of your reloading workflow.
Implementing a Powder Check Weighing System
To eliminate the risk of a critical undercharge or overcharge, incorporate a powder check weighing system into your reloading process. This involves weighing each individual charge to confirm its weight falls within your specified tolerance.
Troubleshooting Common Issues
- Inconsistent Powder Charges: This is often due to improper setup, worn powder disks, or static electricity build-up. Check your setup, clean the measure, and consider using an anti-static tool.
- Powder Bridges: Powder bridging occurs when powder clumps together, preventing proper flow. Use a powder funnel with a vibration system to minimize bridging.
- Powder Measure Sticking: Clean and lubricate moving parts as needed. Use only approved lubricants for this application.
Case Study: Improving Consistency with a Lee Auto Disk
A reloader experienced inconsistent powder charges using their Lee Auto Disk. After carefully reviewing the setup, they discovered a slight misalignment of the measure on their press. Recalibrating after correcting the alignment significantly improved consistency.
Conclusion: A Reliable Tool for Precise Reloading
The Lee Auto Disk Powder Measure offers an excellent value for reloaders seeking a balance between accuracy, speed, and affordability. Understanding its operation, performing proper setup and calibration, and troubleshooting potential issues will unlock its full potential and enable you to consistently produce high-quality, safe ammunition. Remember always to prioritize safety and double-check your work throughout the entire reloading process.