Lee Precision 90058 Perfect Powder Measurer User Manual

1. Product Overview

The Lee Precision Perfect Powder Measurer, model 90058, is designed for precise powder dispensing in reloading applications. It is suitable for both rifle and pistol cases. This versatile tool can be used independently on its included bench-mounted stand or integrated with a Lee Load Master press using the Universal Charging Die.

Figure 1: The Lee Precision 90058 Perfect Powder Measurer, showcasing its red powder hopper, black body, and bench-mounted stand.

2. Safety Information

Always handle reloading components, especially gunpowder, with extreme caution. Follow all safety guidelines provided by powder manufacturers. Ensure proper ventilation when working with reloading materials. Keep out of reach of children and unauthorized individuals.

Legal Disclaimer: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

3. Components

• Powder Hopper: Transparent red container for holding gunpowder.
• Measuring Cylinder: Internal component that meters the powder charge.
• Operating Lever: Used to actuate the measuring cylinder.
• Bench Stand: Base for mounting the measurer to a workbench.
• Adjustable Micrometer: For precise adjustment of powder charge volume.

Figure 2: View of the powder measurer's underside, highlighting the micrometer adjustment and powder drop mechanism.

4. Setup

1. Mounting: Securely attach the powder measurer to a sturdy workbench using the provided bench stand. Ensure it is stable and will not tip during operation.
2. Assembly: Ensure all components, including the powder hopper and measuring cylinder, are correctly assembled and tightened.
3. Initial Conditioning: Before first use, it is recommended to run at least one full hopper of the intended powder through the measurer. This coats the internal surfaces and helps reduce static cling, leading to more consistent charges.

5. Operating Instructions

1. Fill Hopper: Carefully fill the powder hopper with the desired smokeless gunpowder. Do not overfill.
2. Set Charge: Adjust the micrometer screw to the desired powder charge volume. Refer to your reloading manual for appropriate charge weights for your specific caliber and powder type.
3. Dispense Powder: Place a case or powder pan under the powder drop tube. Operate the lever smoothly and consistently to dispense the powder charge. A consistent stroke is crucial for accurate throws.
4. Verify Charge: Periodically verify the dispensed powder charge weight using a sensitive powder scale. Adjust the micrometer as needed to maintain accuracy.
5. Emptying: When finished, rotate the powder hopper to the "off" position (if applicable) and empty any remaining powder back into its original container.

Figure 3: Detailed view of the micrometer adjustment, allowing for fine-tuning of powder charges.

6. Maintenance

After each use, empty all powder from the hopper and measuring cylinder. Clean the internal components with a soft, dry cloth. Do not use solvents or lubricants, as these can contaminate gunpowder and affect performance. Store the measurer in a clean, dry environment.

7. Troubleshooting

• Inconsistent Charges:
  • Ensure consistent operating lever stroke.
  • Verify initial conditioning was performed thoroughly.
  • Check for static cling; running more powder through may help.
  • Ensure powder hopper is at least half full for consistent pressure.
• Powder Leakage:
  • Check that all components are securely tightened.
  • Inspect seals for damage or wear.

8. Specifications

9. Warranty and Support

For detailed warranty information, technical support, or further assistance, please refer to the official Lee Precision website or the comprehensive User Guide PDF available for download. A digital copy of the user guide can be found at: Lee Precision 90058 User Guide (PDF).