The .308 Winchester, a powerhouse cartridge renowned for its accuracy and versatility, demands precise load data for optimal performance. Choosing the right powder is crucial, and H335, a popular extruded powder known for its excellent metering characteristics and consistent burning rate, often tops the list. This guide provides comprehensive H335 load data for .308 Winchester, focusing on safety, accuracy, and achieving the best results. Remember: Always consult your reloading manual before attempting any reloading. This information is for educational purposes only and should not be considered a substitute for professional guidance.
Understanding H335 Powder
H335 is a relatively fast-burning powder, making it suitable for a range of .308 Winchester applications. Its consistent burn rate translates to predictable pressure curves and reduced variations in velocity, contributing to improved accuracy. It's particularly well-suited for lighter to mid-weight bullets, typically in the 150-168 grain range. However, its suitability for heavier bullets is somewhat limited due to its faster burn rate.
Key Properties of H335:
- Extruded Powder: Offers consistent metering, crucial for precise reloading.
- Moderate Burn Rate: Ideal for lighter to mid-weight bullets in .308 Winchester.
- Good Accuracy Potential: Provides consistent velocity, leading to improved shot grouping.
- Versatile Application: Suitable for various bullet weights and applications, from target shooting to hunting.
H335 Load Data for .308 Winchester: (Disclaimer: This data is for informational purposes only. Always consult your reloading manual and start at the minimum charge.)
The following load data is a general guideline and may not be suitable for all firearms or bullets. Always start at the minimum charge listed and work up gradually, carefully monitoring pressure signs. Pressure signs include unusually hard bolt lift, excessive primer flow, or unusual noise. If you observe any pressure signs, immediately cease loading and consult your reloading manual.
| Bullet Weight (grains) | Bullet Type | OAL (inches) | Powder Charge (grains) | Primer | Notes |
|---|---|---|---|---|---|
| 150 | FMJ | 2.800 | 41.0 - 43.0 | CCI 200 | Start at the minimum charge. |
| 150 | SP | 2.800 | 40.5 - 42.5 | CCI 200 | Start at the minimum charge. |
| 168 | FMJBT | 2.810 | 39.5 - 41.5 | CCI 200 | Start at the minimum charge. |
| 168 | HPBT | 2.810 | 39.0 - 41.0 | CCI 200 | Start at the minimum charge. |
Note: OAL (Overall Length) is crucial for safety and accuracy. Always measure your OAL carefully using a case gauge and ensure that it is within the recommended range for your specific bullet and firearm. Different manufacturers may have slightly varying OAL recommendations. Consult your reloading manual for specific guidelines.
Factors Affecting Load Data:
Several factors can influence the ideal powder charge for your specific setup:
- Bullet type: Different bullet types (FMJ, SP, HPBT) have varying ballistic coefficients and may require adjustments to the powder charge.
- Rifle barrel length: Barrel length significantly affects velocity. Shorter barrels typically require slightly lower powder charges.
- Environmental conditions: Temperature and humidity can slightly alter powder burn rates.
- Rifle manufacturer's recommendations: Always consult your rifle's owner's manual for loading guidelines.
Safety Precautions:
Reloading ammunition is inherently dangerous. Failure to follow proper safety procedures can lead to serious injury or death.
- Always wear safety glasses and hearing protection.
- Work in a well-ventilated area.
- Never exceed maximum recommended powder charges.
- Always double-check your work.
- Dispose of any improperly loaded ammunition safely.
This information is for educational purposes only. Always consult your reloading manual and follow all safety precautions before attempting to reload ammunition. Improper reloading practices can result in serious injury or death. Remember to always start at the minimum load and work your way up cautiously, paying attention to pressure signs. Safe and responsible reloading practices are paramount.
