Lee Precision powder measures are popular among reloaders for their affordability and reliability. However, understanding how to properly use a Lee powder measure and interpreting its chart is crucial for safe and accurate reloading. This guide will walk you through everything you need to know about using a Lee powder measure chart, ensuring you consistently achieve the desired powder charge for your cartridges.
Understanding Your Lee Powder Measure
Before diving into the chart, it's important to understand the different types of Lee powder measures and their mechanisms. Lee offers several models, including the:
- Lee Perfect Powder Measure: This is a popular choice known for its accuracy and versatility.
- Lee Auto-Disk Powder Measure: Designed for faster, higher-volume reloading, it's ideal for large batches.
- Lee Pro Auto-Disk Powder Measure: An upgrade on the Auto-Disk, offering enhanced precision and features.
Each measure has a slightly different mechanism, but the underlying principle remains the same: dispensing a consistent amount of powder based on the settings you choose. The crucial element for all is correctly interpreting the provided chart.
Deciphering the Lee Powder Measure Chart
The Lee powder measure chart is the key to accurately setting your measure for the desired powder charge. These charts are specific to the type of powder measure and often to the specific powder you're using. Never use a chart from one powder with another. The powder's flow characteristics significantly impact the dispensing accuracy.
The chart typically lists:
- Powder Type: The specific brand and type of powder (e.g., IMR 4895, Hodgdon Titegroup). This is the most critical piece of information.
- Measure Setting: This is usually a number, often corresponding to a specific mark or position on the powder measure's adjustment mechanism.
- Powder Charge (grains): The amount of powder dispensed per throw at that specific setting.
Example Chart Entry:
| Powder Type | Measure Setting | Powder Charge (grains) |
|---|---|---|
| IMR 4895 | 25 | 42.0 |
| IMR 4895 | 26 | 43.5 |
| Hodgdon Titegroup | 18 | 3.0 |
This example shows that setting the Lee Perfect Powder Measure to "25" will dispense approximately 42.0 grains of IMR 4895. The values are approximate; minor variations are common.
Tips for Accurate Powder Measurement
- Always double-check your powder measure setting against the chart. Human error is a major source of inaccuracy.
- Use a scale to verify your powder charges. This is the only way to guarantee accuracy and safety. Never rely solely on the chart and the powder measure; always weigh your charges.
- Clean your powder measure regularly. Powder buildup can affect the dispensing mechanism and lead to inaccurate charges.
- Maintain consistent powder flow. Avoid variations in pouring technique. A consistent, smooth pour is essential.
- Check the powder for clumping. Break up any clumps before using the powder measure.
- Pay attention to environmental factors. Temperature and humidity can influence powder flow.
Safety First: Essential Precautions
- Always wear safety glasses. Even small powder particles can cause eye irritation.
- Work in a well-ventilated area. Powder fumes can be harmful.
- Never load more powder than the maximum recommended charge for your cartridge. This can cause catastrophic damage to your firearm.
- Always use a powder scale to verify each charge. This is the most crucial step to ensure safe and accurate reloading.
- Consult your reloading manual for recommended load data. The Lee powder measure chart only provides the amount dispensed; you need a reloading manual to determine safe and accurate loads for your specific cartridge and projectile.
By following these guidelines and meticulously utilizing the Lee powder measure chart, you can ensure safe and accurate reloading practices. Remember, safe reloading requires attention to detail, consistent procedures, and a commitment to safety.
