The 7.5 x 55 Swiss, also known as the 7.5x55mm Swiss or 7.5 mm GP11, is a powerful and accurate cartridge with a rich history. Its popularity among reloaders stems from its versatility and suitability for a range of hunting applications. This guide provides comprehensive load data for the 7.5 x 55 Swiss, addressing common questions and concerns. Always prioritize safety and consult your reloading manual before attempting any reloading. This information is for educational purposes only and does not constitute professional reloading advice.
Understanding the 7.5 x 55 Swiss Cartridge
Before delving into load data, understanding the cartridge's characteristics is crucial. The 7.5 x 55 Swiss is a bottlenecked cartridge known for its relatively flat trajectory and excellent accuracy at longer ranges. Its moderate recoil makes it manageable for many shooters. However, its relatively high chamber pressure demands careful attention to proper reloading techniques.
What Bullets Work Best with 7.5 x 55 Swiss?
The optimal bullet weight and type for your 7.5 x 55 Swiss load depend on your intended application (hunting or target shooting) and personal preferences. However, several bullet weights consistently deliver excellent performance:
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139-150 grain bullets: These are popular choices for hunting medium-sized game. They offer a good balance of velocity, energy, and accuracy. Look for bullets designed for hunting with suitable construction for controlled expansion.
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175 grain bullets: Heavier bullets are favored for longer-range shooting and larger game. They provide superior downrange energy but usually at the cost of higher recoil and lower velocity.
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Match-grade bullets: For target shooting, match-grade bullets are recommended for their consistency and accuracy. These bullets often have specific design features to minimize variations in performance.
What Powders Are Suitable for 7.5 x 55 Swiss Reloading?
Powder selection is crucial for safe and accurate reloading. Many powders are compatible with the 7.5 x 55 Swiss, but some perform better than others. Popular choices include:
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IMR 4350: A well-regarded powder known for its consistent performance and accuracy in various cartridges, including the 7.5 x 55 Swiss.
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IMR 4831: Another excellent option for this cartridge, often favored for its suitability for heavier bullets.
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RL-19: A relatively slower-burning powder, ideal for achieving good accuracy with heavier bullets.
Remember: The suitability of a specific powder depends on the bullet weight you are using. Always refer to your reloading manual for specific recommendations and load data.
What are the Best Primers for 7.5 x 55 Swiss?
Reliable primers are essential for consistent ignition. Most standard large rifle primers are suitable for the 7.5 x 55 Swiss. Brands like CCI, Federal, and Remington generally offer good quality and consistent performance.
What is the Best COL (Cartridge Overall Length) for 7.5 x 55 Swiss?
The optimal COL varies slightly depending on the bullet and case manufacturer. It's essential to consult your reloading manual for specific recommendations on COL for your chosen components. Exceeding the maximum COL can lead to dangerous pressure increases. Always measure your COL carefully and consistently.
What is the Maximum Safe Pressure for 7.5 x 55 Swiss?
Maximum safe pressure for the 7.5 x 55 Swiss varies depending on your firearm's chamber and the ammunition components. Consult the loading data provided by the powder manufacturer. Never exceed the recommended maximum pressure.
What are Common Problems Faced While Reloading 7.5 x 55 Swiss?
Common problems associated with 7.5 x 55 Swiss reloading include:
- Over-pressure: Caused by excessive powder charge or incorrect COL. This is a serious safety hazard.
- Inconsistent accuracy: Stems from variations in component quality, improper seating depth, or inconsistent powder charges.
- Difficult extraction: Can be attributed to excessive pressure or improper lubrication.
Conclusion
Reloading the 7.5 x 55 Swiss cartridge offers significant advantages in terms of cost and customization. However, safe and accurate reloading demands meticulous attention to detail, adherence to safety precautions, and consistent application of proper techniques. Always consult your reloading manual for precise load data and safety guidelines. Remember that this is a powerful cartridge, and incorrect reloading practices can lead to serious consequences. This information is for educational purposes only and should not replace professional reloading advice.
