Introduction:
The 7mm-08 Remington is a popular cartridge known for its accuracy and versatility, making it a favorite among hunters and target shooters. This post focuses on reloading data specifically for the Hornady 139 grain SST bullet in the 7mm-08. We'll delve into safe reloading practices, provide detailed data tables, and discuss factors influencing optimal load development. Remember, always prioritize safety when reloading ammunition. Never exceed published maximum loads and always double-check your measurements.
Understanding the 7mm-08 and the Hornady 139 gr SST
The 7mm-08 offers a fantastic balance between recoil and performance, making it suitable for various game animals. Its relatively flat trajectory and manageable recoil contribute to its widespread appeal. The Hornady 139 grain SST (Solid-Base Spire Tip) bullet is a popular choice for hunting applications due to its excellent accuracy, controlled expansion, and deep penetration.
Bullet Characteristics: Hornady 139 gr SST
- Bullet Type: Solid-Base Spire Tip
- Weight: 139 grains
- Design: Designed for controlled expansion and deep penetration, making it ideal for medium-sized game.
- Construction: A tough, reliable bullet suitable for various hunting situations.
Essential Reloading Equipment and Supplies
Before we dive into the data, let's ensure you have the necessary equipment and supplies:
- Reloading Press: A single-stage or progressive press suitable for rifle cartridges.
- Dies: A 7mm-08 reloading die set (sizing die, powder measure, bullet seating die, and crimp die).
- Powder Measure: A reliable powder measure for consistent powder charges.
- Scale: An accurate electronic powder scale for precise powder weighing.
- Case Trimmer: To ensure uniform case length.
- Primer Seating Tool: To safely and consistently seat primers.
- Bullet Puller: For removing bullets from cartridges if necessary.
- Case Lubricant: To reduce friction during sizing.
- 7mm-08 Brass: Clean and inspected brass cases.
- Hornady 139 gr SST Bullets: Ensure they are the correct bullet for your application.
- Suitable Powder: (See data table below) Choose a powder suitable for the 7mm-08 and the 139 gr bullet.
- Small Rifle Primers: The appropriate type of primers for your chosen powder.
7mm-08 Reloading Data: Hornady 139 gr SST
Disclaimer: The following data is for informational purposes only. Always consult the latest reloading manuals from Hornady or other reputable sources for the most up-to-date and accurate load data. Never exceed maximum listed charges. Start at the minimum listed charge and work up gradually, carefully observing for pressure signs.
| Powder | Charge Weight (Grains) | Velocity (fps) (Approx.) | Primer | Notes |
|---|---|---|---|---|
| IMR 4350 | 45.0 - 48.0 | 2600 - 2750 | Small Rifle | Start low, work up gradually |
| IMR 4831SC | 44.0 - 47.0 | 2550 - 2700 | Small Rifle | Start low, work up gradually |
| H4895 | 46.0 - 49.0 | 2650 - 2800 | Small Rifle | Start low, work up gradually |
| RL-19 | 42.5 - 45.5 | 2500 - 2650 | Small Rifle | Start low, work up gradually |
| Other Powders | See Manufacturer's Data | Always consult manufacturer data |
Note: Velocity is approximate and can vary based on barrel length, altitude, temperature, and other factors.
Understanding the Data Table:
The table above provides a range of powder charges for several popular powders. The approximate velocity is given as a guide. It's crucial to understand that these are starting loads. You should carefully work up to the maximum charge, observing your rifle's behavior closely.
Safe Reloading Practices: Essential Tips
- Always wear safety glasses. Reloading can produce dangerous debris.
- Work in a clean and well-lit area. This minimizes mistakes and accidents.
- Never exceed the maximum listed charge. Overloading can lead to catastrophic rifle failure.
- Double-check your measurements. Carefully weigh your powder charges and ensure the correct number of bullets and primers are used.
- Inspect your cases for damage before reloading. Any imperfections can compromise the integrity of your ammunition.
- Consult reputable reloading manuals. Hornady's manual is a great resource.
- Start low and work up gradually. This allows you to identify potential issues before exceeding safe pressure levels.
- Observe for pressure signs. Excessive pressure can manifest as flattened primers, excessive case expansion, or unusually hard bolt lift. If you observe any of these, stop immediately and reduce your powder charge.
Conclusion:
Reloading your own 7mm-08 ammunition with Hornady 139 gr SST bullets can be a rewarding experience. By following safe practices and using the information provided (always referencing manufacturer data), you can create accurate and consistent ammunition for your hunting or target shooting needs. Remember: safety first! Consult additional reloading resources and seek guidance from experienced reloaders if you have any questions or uncertainties. Happy reloading!