The 308 Winchester: A Legend in the Rifle World
The .308 Winchester cartridge, a favorite among hunters, sport shooters, and military personnel, has cemented its place in firearms history. Renowned for its versatility, accuracy, and manageable recoil, the .308 Win is a top choice for a variety of applications. Whether used in bolt-action rifles for long-range target shooting or in semi-automatic platforms for hunting medium to large game, its effectiveness is undeniable. This enduring popularity makes understanding the nuances of reloading the .308 Win cartridge, including the crucial role of tools like the Go No Go gauge, absolutely essential for anyone who practices this craft. Reloading offers significant benefits – cost savings, the ability to customize loads for specific rifles, and a deeper understanding of the entire shooting process. However, it also introduces potential risks that demand careful consideration and adherence to best practices.
The Perilous Path: The Risks of Improper Reloading
Reloading, though rewarding, demands meticulous attention to detail. Improperly loaded ammunition poses significant dangers, ranging from minor malfunctions to catastrophic failures that can seriously injure the shooter and damage the firearm. One critical aspect of safe reloading lies in ensuring that the cartridge cases are correctly sized to fit the rifle chamber. This is where the importance of the Go No Go gauge becomes truly evident. Neglecting this step can lead to a host of problems, including:
- Case Head Separation: This occurs when the case stretches excessively during firing and sizing, eventually leading to a rupture near the base.
- Failure to Extract: An improperly sized case may become stuck in the chamber, making extraction difficult or impossible.
- Overpressure: Attempting to chamber a case that is too long can cause a dangerous increase in pressure upon firing.
- Chamber Damage: Forcefully chambering an oversized case can damage the chamber and potentially lead to a dangerous chain reaction.
The Go No Go Gauge: Your Safety Guardian
The Go No Go gauge is a fundamental tool in the reloader’s arsenal, serving as a critical check to ensure the cases are within acceptable dimensions. It’s a relatively simple device, typically made of hardened steel and precision-ground to exacting specifications, but its function is profoundly important. The gauge is specifically designed to mimic the critical dimensions of a rifle chamber, acting as a “master” to which resized cases are compared. Using a Go No Go gauge allows you to establish whether your resized brass will fit safely and effectively in your rifle’s chamber. The gauge ensures the cartridge case dimensions are within the standards established by SAAMI (Sporting Arms and Ammunition Manufacturers’ Institute).
Understanding the Gauge Components
The Go No Go gauge typically consists of two distinct ends: the “Go” end and the “No Go” end. Each plays a unique role in the testing process:
- The “Go” End: This portion of the gauge represents the *minimum* dimensions of a SAAMI-spec chamber. When a properly resized case is inserted, it should easily fit fully into the Go gauge. If the case resists entering or fails to go in completely, it’s an indication that it’s too large and may be problematic when chambered in your rifle.
- The “No Go” End: The “No Go” end mirrors the *maximum* SAAMI chamber dimensions. Ideally, a case that successfully passes the “Go” test should NOT fit into the “No Go” gauge. This tests for an issue called Headspace, the space between the breech face of the bolt or barrel and the base of a cartridge case when the cartridge is fully seated in the chamber. If the case does fit in the “No Go” end, it means the case is too long (the Headspace of the case to the chamber is too large) and may pose a safety risk, particularly if the brass has stretched beyond safe limits, which can cause case head separation.
Why You Need a 308 Win Go No Go Gauge: A Deep Dive
The 308 Win Go No Go gauge is much more than just a tool; it’s a fundamental safety device and a key component of accuracy. Its utility spans several key areas:
Ensuring Proper Case Sizing
Case sizing is the process of resizing the fired brass to allow it to chamber correctly in your rifle. During firing, brass expands to conform to the chamber dimensions of your rifle. Once fired, it needs to be resized to a manageable size so the brass can safely and repeatably be chambered. If the brass is not correctly resized or the sizing is incorrect, it can lead to a multitude of issues that affect performance and safety. The gauge ensures proper sizing, allowing the resized case to fit in the chamber without excessive interference. Using a full-length sizing die and adjusting it correctly can result in consistently sized cases.
The Safety Shield: Preventing Dangerous Situations
Safety should always be the top priority when reloading. The 308 Win Go No Go gauge provides a critical safety net to prevent dangerous situations. The gauge ensures that your cartridges chamber correctly, preventing issues such as:
- Difficult or Impossible Chambering: An oversized case can get stuck in the chamber, potentially requiring force to extract, damaging your rifle, or, more dangerously, leading to a chamber failure.
- Overpressure Issues: Cartridges that do not chamber correctly can increase chamber pressure, potentially causing catastrophic failure of your firearm.
Boost Your Accuracy and Reliability
Beyond safety, the gauge contributes directly to accuracy and consistent performance. Cases that have been correctly sized will have the same headspacing relative to the chamber of the rifle. This consistency will result in more consistent ignition and bullet flight, leading to tighter groups and better accuracy. Correctly sized cases eliminate the possibility of malfunctions such as failure to extract or cycle smoothly, ensuring a reliable and enjoyable shooting experience.
How to Use a 308 Win Go No Go Gauge: Step-by-Step
The process of using a 308 Win Go No Go gauge is straightforward, but precision and attention to detail are vital. Here’s a step-by-step guide:
Preparing the Cases
Before gauging, your cases must be thoroughly cleaned and properly sized. Use a case trimmer to trim your brass to the correct length. This ensures the cases are prepared for the gauging process.
The Gauging Procedure
- Go Test: Insert a resized and trimmed case into the “Go” gauge. The case should slide in smoothly and completely. If it does not, the case is likely oversized and needs further sizing.
- No Go Test: Remove the case from the “Go” gauge. Insert the same case into the “No Go” gauge. It should *not* fit completely. If it does fit, it indicates that the case is too long. The headspace is out of spec, and the case needs to be trimmed/sized, or it is necessary to re-adjust your sizing die.
Troubleshooting the Process
Understanding potential issues and their causes is crucial for successful reloading. Here are a few common problems and solutions:
- The Case Sticks in the Go Gauge: This usually indicates insufficient sizing. You likely need to adjust your full-length sizing die to resize the cases further. Refer to the manufacturer’s instructions for proper die adjustment. It’s also possible that you have a buildup of dirt in the chamber.
- The Case Fails the Go Test: If the case doesn’t fit the Go gauge, something is preventing the brass from fully seating. This could result from cases needing to be trimmed or needing to be sized correctly again. The best approach is to double-check your case preparation procedures.
- The Case Fits the No Go Gauge: If the case fits the No Go gauge, it means your cases are too long or your sizing die is not contacting the shoulder of the cartridge. You will need to re-size your cases, trim, and re-check to find the issue.
Fine-Tuning After Adjustment
After any adjustment to your sizing die, or your case length, re-check the brass with the Go No Go gauge. Make small, incremental adjustments, and gauge the cases after each adjustment. Always prioritize safety; your goal should be brass that is just within specification.
Selecting the Right 308 Win Go No Go Gauge
When buying a 308 Win Go No Go gauge, consider these factors:
The Source and Standards
Purchase your gauge from a reputable manufacturer. Be certain that the gauge has been made to SAAMI specifications. This will guarantee that it is accurately calibrated to the standard cartridge and chamber dimensions.
Types of Gauges
Different gauges can serve varying purposes. The gauges will often be labeled for a specific case or cartridge. Headspace gauges are probably the most commonly used type of gauge for reloading.
Construction and Durability
Look for a gauge made from hardened steel. The gauge should be built to withstand frequent use and maintain its precision over time.
Handling and Storage Precautions
Handle the gauge with care, and avoid dropping it. Store the gauge in a clean, dry environment to prevent rust and damage. Keep the gauge separate from other tools and equipment to avoid cross-contamination.
Considering Alternative Methods and Limitations
While the Go No Go gauge is an essential tool, other techniques and considerations can supplement your safety practices:
Exploring Other Headspace Checks
If you are unsure if your cases are correctly sized, try comparing them to factory-loaded ammunition. If your resized cases are noticeably larger than the factory rounds, further sizing may be necessary. Use an accurate measuring tool to measure the length of the case, and its body, to see if the case may be too long.
Chamber-Specific Considerations
Some shooters prefer to use gauges specifically designed for the particular rifle chamber they use. These gauges can provide a more precise fit.
The Limits of the Gauge
The Go No Go gauge provides a critical checkpoint, but it doesn’t guarantee all reloading challenges are resolved. It only confirms that the cases are sized within the SAAMI specifications. Always adhere to safe reloading practices and carefully examine your cases for signs of stress or wear.
When to Consult a Professional
If you encounter repeated issues or are unsure about any aspect of the reloading process, consult a qualified gunsmith or experienced reloader. Seeking professional advice is always a good idea when it comes to firearms.
Conclusion: Safety and Precision at the Forefront
The 308 Win Go No Go gauge is an indispensable asset for any reloader of the .308 Winchester cartridge. By providing a reliable means of verifying the case sizing, the gauge plays a vital role in safe reloading and accuracy. By embracing this tool, you’re investing in the safety and performance of your firearms. Remember to always prioritize safety, adhere to recommended reloading practices, and carefully scrutinize your work. Consistent attention to detail, alongside this essential tool, will ensure your reloading endeavors are successful and enjoyable.
Resources:
- Reloading manuals are invaluable for any reloader. They provide essential information, and step-by-step instructions to safely reload your ammunition.
- Refer to SAAMI specifications for guidance on cartridge and chamber dimensions.
- Research and buy a 308 Win Go No Go gauge from reputable manufacturers.
- Look for additional reloading guidance online, from expert sources.
