The 7.5x55 Swiss, also known as the 7.5x55mm Swiss GP11, is a powerful and accurate cartridge with a rich history. Relatively uncommon in the US, its popularity is growing among long-range shooters and hunters. This guide provides comprehensive reloading data for the 7.5x55 Swiss, emphasizing safety and accuracy. Remember: Always consult your reloading manual and start at the minimum charge. This information is for guidance only and doesn't replace responsible reloading practices.
Understanding the 7.5x55 Swiss Cartridge
The 7.5x55 Swiss is a bottleneck cartridge known for its flat trajectory and high ballistic coefficient bullets. Its origins trace back to the Swiss military, designed for both hunting and military applications. This history gives it a reputation for robust construction and reliable performance. The cartridge's design prioritizes long-range accuracy, making it an ideal choice for precision shooting and hunting at extended ranges. It's capable of achieving sub-MOA accuracy with careful load development.
Key Cartridge Characteristics:
- Case Capacity: Relatively high compared to other similar cartridges.
- Shoulder Angle: Steep, contributing to its powerful performance.
- Bullet Weight: Typically ranges from 139 to 175 grains.
- Common Bullet Types: Full metal jacket (FMJ), spitzer boat tail (SBT), and controlled expansion hunting bullets.
Reloading Components for 7.5x55 Swiss
Before you begin reloading, gather the necessary components:
- Brass: Finding 7.5x55 Swiss brass might require searching specialized suppliers. Proper case preparation, including cleaning, inspecting, and sizing, is crucial for consistent reloading.
- Bullets: A wide variety of bullets are suitable, but selecting the right weight and type is essential for optimal accuracy and performance. Consider the intended application (hunting or target shooting).
- Powders: Several powders work well with the 7.5x55 Swiss. Experimentation is encouraged to find the best powder for your specific rifle and components. Popular choices include IMR 4350, IMR 4831, and RL-22.
- Primers: Use a large rifle magnum primer, ensuring they are appropriate for the powder you're using. The primer type significantly impacts ignition reliability and consistency.
- Dies: A full-length resizing die, a seating die, and a bullet crimp die are essential. These tools ensure proper case sizing, bullet seating depth, and crimp for safe and accurate firing.
7.5x55 Swiss Reloading Data (Sample)
Disclaimer: The following data is a sample and should not be considered a complete or definitive reloading guide. Always consult your reloading manual and start at the minimum load. This data is for illustrative purposes only. Failure to follow proper reloading procedures can result in serious injury or damage to your firearm.
| Powder | Bullet Weight (grains) | Bullet Type | Primer | Min Charge (grains) | Max Charge (grains) | COL (inches) | Notes |
|---|---|---|---|---|---|---|---|
| IMR 4350 | 150 | FMJ | Large Rifle Mag | 44.0 | 47.0 | 2.85 | Start low and work up. |
| IMR 4831 | 175 | SBT | Large Rifle Mag | 40.0 | 43.0 | 2.90 | Increased pressure potential with heavier bullets. |
| RL-22 | 139 | Controlled Exp | Large Rifle Mag | 46.0 | 49.0 | 2.80 | Accurate in many rifles |
Note: COL refers to Cartridge Overall Length. This measurement is crucial for safe and accurate functioning of the cartridge in your firearm. Incorrect COL can lead to pressure problems and damage to your rifle.
Safety Precautions for Reloading 7.5x55 Swiss
- Always wear safety glasses and hearing protection. Reloading involves potentially dangerous processes.
- Work in a clean, well-ventilated area. Avoid dust and debris that can contaminate your components.
- Use a scale that is accurate to at least 0.1 grain. Inaccurate powder charges can lead to dangerous pressure increases.
- Double-check your powder charges before seating bullets. This is crucial to prevent accidental overcharging.
- Never exceed the maximum charge listed in your reloading manual or reputable data sources. Overcharging is a major cause of firearm damage and injury.
- Inspect your cases for damage before reloading. Damaged cases can lead to malfunctions and pressure spikes.
- Regularly clean and maintain your reloading equipment. Properly maintained equipment contributes to safety and precision.
Finding Reliable Reloading Data
Multiple sources offer reloading data, but reliability is key. Consult your reloading manual, reputable online forums (with caution), and books on reloading for verified data. Always prioritize safety and start with minimum loads, working your way up gradually. Remember to keep detailed records of your loads and results.
This detailed guide provides foundational information on reloading 7.5x55 Swiss. Remember, responsible reloading practices and meticulous attention to detail are paramount for safe and enjoyable shooting. Always prioritize safety and consult your manual before attempting to reload any cartridge.