The .308 Winchester, a powerhouse cartridge renowned for its accuracy and versatility, demands careful consideration when it comes to reloading. Choosing the right powder is crucial, and Winchester 748 has earned a strong reputation among reloaders for its performance in this caliber. This guide delves into the specifics of using Winchester 748 powder for .308 Winchester loads, covering safety, accuracy, and optimal charge weights. We'll explore various bullet weights and provide resources to help you build safe and effective ammunition.
Understanding Winchester 748 Powder
Winchester 748 is a medium-burning rate, extruded powder designed for various rifle cartridges, including the .308 Winchester. Its moderate burn rate makes it suitable for a wide range of bullet weights and velocities, offering flexibility to reloaders. However, understanding its characteristics is vital for safe and accurate loading. It's crucial to remember that never should you deviate from published load data.
Key Characteristics of Winchester 748:
- Burn Rate: Medium
- Application: Rifle cartridges
- Type: Extruded
- Known for: Clean burning, consistent performance
Safety First: Essential Precautions for Reloading
Reloading ammunition carries inherent risks. Failing to follow safety procedures can lead to serious injury or damage. Always prioritize safety when working with firearms and reloading equipment.
- Consult load manuals: Always start with load data published by reputable sources like Hodgdon, Accurate Arms, or the manufacturer's website itself. Never extrapolate or guess at load data.
- Use a scale: Precise powder measurement is non-negotiable. Use a quality powder scale capable of measuring in grains.
- Double-check your work: Before seating a bullet, meticulously verify the powder charge in each case. Err on the side of caution.
- Proper equipment: Invest in good quality reloading equipment that's in excellent working order. Regular maintenance is essential.
- Eye and hearing protection: Always wear appropriate safety glasses and hearing protection.
Winchester 748 Load Data for .308 Winchester: A Sample
The following table provides sample load data for the .308 Winchester using Winchester 748 powder. This data should not be considered exhaustive and should not be substituted for data from reputable load manuals. This table is for illustrative purposes only.
| Bullet Weight (grains) | Bullet Type | Powder Charge (grains) | Primer | OAL (inches) | Velocity (fps) (Approximate) | Notes |
|---|---|---|---|---|---|---|
| 150 | FMJ | 42.0 | CCI 200 | 2.800 | 2600 | Data from Hodgdon or other reputable sources is needed. |
| 168 | FMJBT | 40.5 | CCI 200 | 2.810 | 2500 | Data from Hodgdon or other reputable sources is needed. |
| 175 | SMK | 39.0 | CCI 200 | 2.820 | 2400 | Data from Hodgdon or other reputable sources is needed. |
Disclaimer: The velocities listed above are approximate and can vary depending on several factors, including barrel length, temperature, and the specific lot of powder used. Always work up loads carefully, starting with the minimum charge and increasing incrementally while closely monitoring pressure signs.
Factors Influencing Load Data
Several factors can influence the optimal load data for your specific setup. These include:
- Barrel Length: A longer barrel generally yields higher velocities.
- Bullet Type: Different bullet designs (e.g., boat tail, hollow point) can impact performance.
- Primer Type: The primer choice can slightly affect ignition characteristics.
- Environmental Conditions: Temperature and humidity can affect powder burn rate.
- Powder Lot: Even within the same powder type, different lots can have slight variations.
Finding Reliable Load Data
Your safety is paramount. Rely solely on load data published by reputable sources, which thoroughly test each powder-bullet-primer combination. Never use load data from unverified sources or online forums. Here are some reliable sources for load data:
- Hodgdon Reloading Data Center: www.hodgdon.com
- Accurate Arms: www.accuratepowder.com
- Winchester Ammunition: www.winchester.com (May not have extensive reloading data)
- Your Reloading Manual: Invest in a current reloading manual from a reputable publisher.
Conclusion: Responsible Reloading with Winchester 748
Reloading .308 Winchester ammunition with Winchester 748 powder can be a rewarding experience. However, responsible and safe reloading practices are paramount. Always consult reliable load manuals, use accurate measuring tools, and meticulously double-check your work. Remember, the information provided here is for general guidance; always refer to published load data for specific recommendations. Prioritize safety and enjoy the precision of your handloaded ammunition.