The Hornady Headspace Comparator is a precision tool used by reloaders to ensure consistent and safe cartridge headspace. Accurate headspace is crucial for reliable ignition, consistent chamber pressure, and preventing dangerous over-pressure situations. This guide provides a comprehensive overview of the Hornady Headspace Comparator, including a size chart and detailed instructions on its proper use.
Understanding Headspace
Headspace refers to the distance between the head of the cartridge case and the breech face of the firearm's chamber. Too much headspace (go-gauge) can lead to insufficient primer ignition and potentially dangerous pressure spikes. Too little headspace (no-go gauge) can result in difficulty chambering and potentially damage the firearm. The Hornady Headspace Comparator helps you precisely measure this critical dimension.
The Hornady Headspace Comparator: How it Works
The comparator uses a set of precisely machined gauges to check the headspace of fired cases. These gauges are specific to the cartridge caliber. By inserting a fired case into the comparator and comparing it to the gauges, you can quickly and accurately determine if your headspace is within the safe operating range.
Hornady Headspace Comparator Size Chart (Partial)
Note: A complete size chart for all calibers is available in the Hornady reloading manuals or on their official website. The chart below illustrates the concept and provides examples for a few popular calibers. Always refer to the manufacturer's specific instructions and gauges for your firearm and ammunition.
| Cartridge Caliber | Go Gauge (Max Headspace) | No-Go Gauge (Min Headspace) |
|---|---|---|
| .223 Remington | (Specific measurement varies by manufacturer) | (Specific measurement varies by manufacturer) |
| .308 Winchester | (Specific measurement varies by manufacturer) | (Specific measurement varies by manufacturer) |
| 9mm Luger | (Specific measurement varies by manufacturer) | (Specific measurement varies by manufacturer) |
| .45 ACP | (Specific measurement varies by manufacturer) | (Specific measurement varies by manufacturer) |
Disclaimer: The values provided above are for illustrative purposes only and should not be used for actual headspace measurement. Always consult the Hornady manual or your firearm's documentation for the correct gauge dimensions for your specific cartridge and firearm.
Using the Hornady Headspace Comparator: Step-by-Step Guide
- Select the Correct Gauges: Ensure you have the correct go and no-go gauges for your specific cartridge caliber.
- Prepare a Fired Case: Select a fired case that shows no signs of damage or deformation.
- Insert the Case: Insert the fired case into the comparator body, ensuring it is seated correctly.
- Compare to the Go Gauge: Insert the go gauge. If the case extends past the gauge, headspace is within acceptable limits.
- Compare to the No-Go Gauge: Insert the no-go gauge. If the case does not extend past the gauge, headspace is too short.
- Interpret Results: If the case extends past the go gauge, but not the no-go gauge, your headspace is within the acceptable range. If the case does not extend past the no-go gauge, it indicates insufficient headspace. If it extends past the go gauge, it indicates excessive headspace. Both extremes require attention.
Importance of Accurate Headspace Measurement
Regularly checking headspace is an essential part of responsible reloading. Inconsistent headspace can lead to malfunctions, inaccurate bullet placement, and unsafe pressure levels. The Hornady Headspace Comparator provides a reliable method for ensuring your ammunition is loaded safely and performs optimally.
Safety Precautions
Always prioritize safety when working with firearms and ammunition. Proper training and adherence to manufacturer's guidelines are crucial. Consult experienced reloaders or gunsmiths if you are unsure about any aspect of the reloading process.
This guide provides a general overview of the Hornady Headspace Comparator and its use. Always consult the official Hornady documentation for specific details and safety instructions related to your particular cartridge and firearm. Remember, safe and responsible reloading practices are paramount.
