The 280 Ackley Improved (AI) is a wildcat cartridge, meaning it wasn't designed by a major ammunition manufacturer. It's a modified version of the popular 7mm Remington Magnum, offering increased case capacity and improved ballistic performance. This results in higher velocities and flatter trajectories, making it a favorite among long-range shooters and hunters seeking exceptional accuracy. However, reloading for the 280 Ackley Improved requires precision and attention to detail. This guide will provide comprehensive reloading data, safety tips, and best practices for this powerful cartridge.
Understanding the 280 Ackley Improved
The 280 AI's key difference from the 7mm Remington Magnum lies in its improved case design. The shoulder is blown out, creating a sharper angle, which increases the case's internal volume. This increased capacity allows for more powder, leading to higher pressures and velocities. This seemingly simple modification significantly impacts the cartridge's ballistics and performance.
Advantages of the 280 Ackley Improved
- Increased Velocity: The larger case capacity translates directly into higher muzzle velocities for the same bullet weight, resulting in flatter trajectories and extended range.
- Improved Accuracy: Many shooters report enhanced accuracy with the 280 AI compared to the parent 7mm Remington Magnum. The improved case design contributes to more consistent ignition and combustion.
- Greater Range: The combination of higher velocity and improved accuracy allows for effective shots at longer distances.
- Versatility: The 280 AI is suitable for a wide range of hunting applications, from varmints to larger game, depending on bullet selection.
Disadvantages of the 280 Ackley Improved
- Case Preparation: The improved case requires careful preparation, including proper neck turning and potentially fire forming. Improper case preparation can significantly affect accuracy and safety.
- Necessity of Reloading: Factory ammunition is limited or nonexistent for the 280 Ackley Improved. Reloading is essential for utilizing this cartridge.
- Higher Pressures: The increased case capacity results in higher chamber pressures. It's crucial to follow precise reloading data and carefully monitor for signs of excessive pressure.
280 Ackley Improved Reloading Data
Disclaimer: The following data is for informational purposes only. Always start at the minimum load and work up gradually, carefully observing for signs of excessive pressure. Never exceed the maximum listed load. Consult multiple reputable sources and verify data before reloading. Your specific rifle's chamber dimensions might influence optimal loads.
| Bullet Weight (grains) | Powder Type | Powder Charge (grains) | Primer | COL (inches) | Notes |
|---|---|---|---|---|---|
| 140 | RL22 | 60.0 - 62.0 | CCI 250 | 2.850 - 2.870 | Start Low, Work Up |
| 140 | H1000 | 63.0 - 65.0 | Remington 9 1/2 | 2.850 - 2.870 | Start Low, Work Up |
| 160 | RL26 | 61.0 - 63.0 | Federal 215 | 2.880 - 2.900 | Start Low, Work Up |
| 168 | Retumbo | 64.0 - 66.0 | Winchester WLR | 2.900 - 2.920 | Start Low, Work Up |
Important Considerations:
- Powder Type: The choice of powder significantly impacts performance. Experimentation might be necessary to find the best powder for your specific setup.
- Primer Type: Primer type can also affect ignition and pressure. Using the recommended primer type is crucial.
- Case Length: Case length should be consistent. Trimming is essential to maintain accuracy and prevent pressure issues.
- Bullet Seating Depth: The bullet seating depth influences accuracy and pressure. Start at the recommended COL and make small adjustments as needed.
- Signs of Excessive Pressure: Watch for flattened primers, excessive case expansion, unusual noises, or excessive recoil. If any of these occur, immediately cease reloading and investigate the cause.
Essential Reloading Equipment and Techniques
- Accurate Scale: A precise powder scale is vital for consistent and safe reloading.
- Case Trimmer: Maintain consistent case length.
- Bullet Seating Die: For proper bullet seating depth.
- Neck Sizing Die: To resize the neck of the case while preserving the body dimensions.
- Case Lubricant: To facilitate the resizing process.
- Primer Seating Tool: Accurate primer seating is essential.
- Chronograph: To measure velocity and fine-tune loads.
Case Preparation: Fire Forming
Since the 280 Ackley Improved is a wildcat round, you'll likely need to fire form your brass. This involves firing a test round in your rifle to form the case to your specific chamber dimensions. Ensure that the test round is loaded with a reduced charge to prevent excessive pressure during this process. After firing, trim and prep the formed cases for future reloading.
Safety First!
Reloading ammunition is inherently dangerous. Failure to follow safety procedures can result in serious injury or death. Always:
- Read and follow all instructions carefully.
- Wear safety glasses to protect your eyes.
- Handle ammunition with respect.
- Never exceed maximum recommended loads.
- Inspect your cases and ammunition thoroughly before loading.
The 280 Ackley Improved is a powerful and accurate cartridge. With proper attention to detail, diligent adherence to safety protocols, and careful use of reloading data, you can enjoy the benefits of this high-performance wildcat cartridge. Remember to always prioritize safety and consult multiple sources for reloading data. Happy reloading!