Finding the perfect load for your precision rifle can feel like searching for a needle in a haystack. But with meticulous attention to detail and a methodical approach, achieving optimal accuracy with ammunition like the Hornady 175gr Sub-X is entirely achievable. This guide delves into the intricacies of loading data for this popular bullet, offering insights to help you develop a consistently accurate and reliable load for your specific rifle.
Disclaimer: Always consult the Hornady reloading manual and other reputable sources for load data. This information is for educational purposes only and should not be considered a substitute for responsible reloading practices. Improper reloading techniques can lead to serious injury or death. Always wear appropriate safety gear.
Understanding the Hornady 175gr Sub-X Bullet
The Hornady 175gr Sub-X bullet is designed for long-range precision shooting. Its characteristics make it a popular choice among competitive shooters and hunters alike. Key features contributing to its accuracy include:
- High Sectional Density (SD): The 175gr weight coupled with its design results in a high SD, minimizing wind drift at longer ranges.
- Boat Tail Design: The boat tail design reduces drag, further enhancing accuracy and range.
- Match Grade Construction: Hornady employs high-quality materials and precise manufacturing processes to guarantee consistent bullet performance.
Factors Influencing Load Development
Developing a precise load for the Hornady 175gr Sub-X involves considering several crucial factors:
1. Rifle Caliber and Twist Rate:
The 175gr Sub-X is typically used in .308 Winchester, but compatibility depends on your rifle's twist rate. A slower twist rate may not stabilize this heavier bullet, resulting in poor accuracy. Check your rifle's specifications to ensure compatibility.
2. Powder Selection:
Powder selection is critical for achieving optimal pressure and velocity. Several powders are suitable for the 175gr Sub-X, including but not limited to:
- Varget: A popular choice known for its consistent burn rate and accuracy.
- RL15: Another excellent option providing good accuracy and velocity.
- IMR 4064: A versatile powder often used in .308 Winchester loads.
Note: This is not an exhaustive list, and the best powder will vary depending on your specific rifle and environmental conditions.
3. Primer Type:
Small rifle magnum primers are generally recommended for optimal ignition consistency.
4. Case Preparation:
Consistent case preparation is essential for achieving accurate and repeatable results. This includes:
- Full-length resizing: Ensuring uniform case dimensions.
- Trimming: Maintaining consistent case length.
- Deburring: Removing any sharp edges.
- Cleaning: Removing any residue from previous loadings.
5. Environmental Conditions:
Temperature and humidity can significantly affect powder burn rate and therefore accuracy. Consider these factors when testing different loads.
A Step-by-Step Guide to Load Development (General Outline)
- Start Low, Go Slow: Begin with the minimum charge weight recommended by Hornady or other reputable sources.
- Incremental Increases: Gradually increase the powder charge in small increments (0.1-0.2 grains), carefully recording each step.
- Accuracy Testing: Fire three to five shots at each charge weight, noting the group size and point of impact.
- Velocity Measurement: Use a chronograph to measure velocity at each charge weight.
- Pressure Signs: Monitor for signs of excessive pressure, such as flattened primers, excessively hard bolt lift, or unusually loud reports. Immediately stop if any signs of over-pressure are detected.
- Optimize for Accuracy: Identify the charge weight that produces the smallest group size at a safe pressure level.
- Fine-tuning: Once you’ve found a promising load, make small adjustments to further optimize accuracy.
Conclusion
Developing a precise load for the Hornady 175gr Sub-X requires patience, attention to detail, and a commitment to safe reloading practices. By following the steps outlined above and meticulously recording your findings, you can create a load that consistently delivers exceptional accuracy for your specific rifle and conditions. Remember to always prioritize safety and consult reputable resources before embarking on your load development journey. Happy shooting!
