Understanding the Dillon 550 case trimmer and its conversion chart is crucial for precision reloading. This comprehensive guide will walk you through the Dillon 550 case trimmer, its functionalities, and how to effectively use the conversion chart for optimal results. We'll also explore frequently asked questions and troubleshoot common problems. Knowing how to use your Dillon 550 effectively will ensure consistent, accurate cartridge preparation, leading to improved accuracy and reliability on the range.
Understanding the Dillon 550 Case Trimmer
The Dillon 550 case trimmer is a popular choice among reloaders for its efficiency and accuracy. It's designed to trim brass cases to a precise length, ensuring consistent chambering and optimal performance. The process involves using a cutting mechanism to remove excess brass from the case mouth. Accurate trimming is essential; too short, and the case may not chamber correctly; too long, and it can lead to pressure issues. This is where the conversion chart becomes indispensable.
The Dillon 550 utilizes a system of interchangeable components, including different shell holders and cutting blades, to accommodate a wide range of cartridge cases. This adaptability is a key feature of the machine, but it also necessitates a thorough understanding of the conversion chart.
Deciphering the Dillon 550 Conversion Chart
The Dillon 550 conversion chart is a vital tool that translates the case length measurements into the correct settings on the trimmer. It acts as a reference guide to ensure consistent trimming results across different cartridge types. The chart typically lists various cartridge cases and their corresponding trimming lengths.
Important Components of the Chart:
- Cartridge Caliber: This specifies the type of ammunition (e.g., .223 Remington, 9mm Luger).
- Case Length: This provides the ideal trimmed length for the cartridge. This measurement is crucial for consistent performance.
- Dillon 550 Setting: This indicates the specific adjustment needed on your Dillon 550 trimmer to achieve the desired length. This is often expressed as a number or a specific position on the trimmer's scale.
Example Chart Entry:
| Cartridge Caliber | Case Length (Trimmed) | Dillon 550 Setting |
|---|---|---|
| .223 Remington | 1.750" | 2.0 |
| 9mm Luger | 0.900" | 1.2 |
| .308 Winchester | 2.005" | 2.5 |
Note: The specific values will vary depending on the version of the Dillon 550 conversion chart you are using. Always refer to the chart provided with your specific trimmer model.
Using the Dillon 550 Conversion Chart: A Step-by-Step Guide
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Identify Your Cartridge: Determine the exact caliber of the cartridges you are trimming. Double-check to avoid errors.
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Locate the Correct Entry: Find the corresponding entry in your Dillon 550 conversion chart for your cartridge caliber.
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Adjust the Trimmer: Carefully adjust the Dillon 550 trimmer according to the "Dillon 550 Setting" indicated on the chart.
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Test Trim: Trim one case as a test. Measure the trimmed case length using a reliable caliper. This verifies the accuracy of your adjustment.
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Adjust as Necessary: If the trimmed length isn't within the acceptable tolerance, fine-tune the trimmer setting and repeat the test until you achieve the desired length.
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Trim Remaining Cases: Once you have the correct setting, proceed to trim the rest of your brass cases.
Troubleshooting Common Issues
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Inconsistent Trimming: This could be due to a dull cutting blade, incorrect trimmer setting, or improperly seated case. Check blade sharpness, re-check the conversion chart and ensure the case is securely held.
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Cases Too Short/Too Long: This directly points to an incorrect setting. Re-check your chart and the trimmer adjustment. A slight adjustment might be needed for optimal results.
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Damaged Cases: Over-tightening the shell holder or using a dull blade can damage cases. Always use caution and a sharp blade.
Frequently Asked Questions (FAQs)
Q: Where can I find the Dillon 550 conversion chart?
A: The chart is usually included with the Dillon 550 case trimmer. You can also find downloadable versions on the Dillon Precision website or various reloading forums.
Q: Can I use the Dillon 550 to trim different calibers?
A: Yes, the Dillon 550 is designed to handle various calibers with the use of different shell holders and cutting blades (sold separately). Make sure you use the correct setup for your specific cartridge type and check the conversion chart.
Q: How often should I replace the cutting blade?
A: The lifespan of a cutting blade depends on usage. A dull blade will result in inconsistent trimming. Replace when you notice that the trimming quality is decreasing.
Q: What happens if I trim the cases too short?
A: Cases trimmed too short might not chamber properly, leading to misfires and potential damage.
Conclusion:
The Dillon 550 conversion chart is an essential tool for precise reloading. By understanding how to use it effectively and following the steps outlined above, you can ensure consistent, accurate cartridge preparation, resulting in improved shooting accuracy and overall reloading success. Remember to always prioritize safety and double-check your work. Happy reloading!