The Hornady Bullet Comparator is a precision tool used by reloaders to accurately measure and sort bullets, ensuring consistent performance and safety. Understanding how to use the comparator and interpreting the measurements it provides is crucial for successful reloading. This guide will provide a comprehensive overview of the Hornady Bullet Comparator, including its functionalities and a detailed explanation of interpreting the size chart. We will also discuss troubleshooting common issues.
Understanding the Hornady Bullet Comparator
The Hornady Bullet Comparator is designed to measure the overall length (OAL) and base-to-ogive (BTO) of bullets. This data is essential for:
- Consistent Reloading: Ensuring all your bullets have the same dimensions leads to consistent cartridge performance and accuracy.
- Bullet Sorting: Identifying bullets that fall outside the acceptable range prevents potential problems like squib loads or pressure issues.
- Troubleshooting: Analyzing comparator data can help pinpoint issues in your reloading process.
The comparator uses a calibrated micrometer to take these precise measurements. The results are then compared to the manufacturer's specifications or your own established tolerances.
Interpreting the Hornady Bullet Comparator Size Chart
The Hornady Bullet Comparator doesn't come with a pre-printed "size chart" in the traditional sense. Instead, the data you collect is compared against your own baseline measurements and manufacturer's specifications for the bullet you're using. Think of it less as a chart and more as a data-driven quality control system.
Here's how to interpret the measurements you gather:
1. Establishing a Baseline
Before sorting a batch of bullets, measure several (at least 10) representative samples from a new box of bullets using the Hornady Bullet Comparator. Record the OAL and BTO for each bullet. Calculate the average OAL and BTO, and establish a tolerance range (typically ±0.001 inches or less). This becomes your baseline for comparing subsequent batches or lots.
2. Measuring Your Bullets
Using the same procedure, measure each bullet in the batch you intend to load. Record the OAL and BTO for each bullet.
3. Comparing Measurements
Compare the OAL and BTO measurements of each bullet against your established baseline. Any bullets that fall outside your defined tolerance range should be set aside. These bullets are considered outliers and may lead to inconsistencies in your reloading process.
4. Understanding Outliers
If you find a significant number of outliers (e.g., more than 10%), it's critical to investigate the cause. This could indicate:
- Variations in Manufacturing: Some bullet manufacturers have stricter quality control than others.
- Damage During Handling: Bullets may become deformed during shipping or handling.
- Inconsistent Seating Depth: Issues with your reloading dies or seating depth can cause inconsistent OAL.
Troubleshooting Common Issues
Below are some common problems encountered when using the Hornady Bullet Comparator and how to address them:
| Problem | Possible Cause(s) | Solution |
|---|---|---|
| Inconsistent Measurements | Comparator not properly calibrated; dirty comparator; | Recalibrate the comparator; clean the comparator thoroughly; re-check technique. |
| Large Number of Outliers | Manufacturing variations; damage during handling | Check the bullet manufacturer's specifications; inspect bullets for damage. |
| Difficulty Obtaining Readings | Improper bullet seating in the comparator; incorrect technique | Ensure proper seating; refer to Hornady's instructions for optimal technique. |
Case Study: Identifying a Problem Batch
Let's say you're loading .308 Winchester ammunition. Your established baseline for OAL is 2.005 inches ± 0.001 inches. During your measurement process, you notice that 20 out of 100 bullets measure 2.007 inches or longer. This indicates a problem with that batch of bullets. This could be due to manufacturing variations or damage. You should immediately inspect the bullets and either return the batch to the supplier or segregate these bullets from the rest for use in a different application, avoiding use for critical applications such as hunting or competition shooting.
Conclusion
The Hornady Bullet Comparator is an invaluable tool for reloaders seeking precision and consistency. While it doesn't provide a traditional size chart, the data it provides, when properly analyzed, helps in identifying and resolving inconsistencies. By meticulously following the measurement process and understanding how to interpret the results, you can ensure safe and accurate reloading, significantly improving your overall performance. Remember safety is paramount in reloading, so always refer to the manufacturer's instructions for your specific reloading equipment and ammunition.