The .280 Ackley Improved (AI) cartridge, a wildcat round based on the popular .280 Remington, offers improved ballistic performance and accuracy. This guide provides comprehensive reloading data for the .280 AI, focusing on safety and optimal results. Always prioritize safety and consult your reloading manual before attempting to reload ammunition. This information is for educational purposes only and should not be considered a substitute for professional guidance.
Understanding the .280 Ackley Improved
The .280 AI features a sharper shoulder angle than the parent .280 Remington, resulting in increased case capacity. This increased capacity allows for higher powder charges, leading to greater velocity and flatter trajectories. However, this also requires careful attention to reloading practices to ensure safety and consistent performance. The improved case design necessitates the use of specific reloading dies and may require minor case preparation beyond standard procedures.
Key Differences from .280 Remington Reloading:
- Sharper Shoulder Angle: This necessitates the use of Ackley Improved-specific reloading dies to properly form the case. Using standard .280 Remington dies will result in improperly formed cases and potentially dangerous pressure issues.
- Increased Case Capacity: This allows for heavier powder charges, but requires careful attention to pressure signs to avoid exceeding safe limits.
- Potential for Higher Pressure: Due to the increased capacity, there's a higher potential for exceeding safe pressure limits if reloading data isn't meticulously followed. Regular pressure testing is highly recommended.
Reloading Data for the .280 Ackley Improved
The following data is for illustrative purposes only and should never be used without consulting your own reloading manual and conducting thorough pressure testing. Variations in brass, powder, primers, and bullets will significantly impact pressure. Always start at the minimum load and work up gradually.
(Disclaimer: This data is for informational purposes only and does not constitute a recommendation. Always consult your reloading manual and perform your own pressure testing.)
| Bullet Weight (grains) | Powder (Type and Weight, grains) | Primer | COL (inches) | Notes |
|---|---|---|---|---|
| 140 | IMR 4350 (55.0 - 57.0) | CCI 200 | 2.800 | Start low and work up gradually |
| 140 | RL 22 (56.0 - 58.0) | Federal 210M | 2.800 | Start low and work up gradually |
| 150 | IMR 4350 (53.0 - 55.0) | CCI 200 | 2.810 | Start low and work up gradually |
| 150 | RL 22 (54.0 - 56.0) | Federal 210M | 2.810 | Start low and work up gradually |
| 160 | IMR 4350 (51.0 - 53.0) | CCI 200 | 2.820 | Start low and work up gradually |
| 160 | RL 22 (52.0 - 54.0) | Federal 210M | 2.820 | Start low and work up gradually |
Note: COL refers to Cartridge Overall Length. This measurement is crucial for proper chambering and should be meticulously checked.
Essential Reloading Equipment and Procedures
Reloading .280 AI requires specific equipment and careful attention to detail. This includes:
- .280 Ackley Improved reloading dies: Standard .280 Remington dies will not work.
- Accurate reloading scale: Precise powder measurement is crucial for safety and consistent performance.
- Case trimmer: Trimming cases to uniform length is vital for consistent chambering and pressure.
- Bullet puller: Useful for removing bullets from improperly loaded cartridges.
- Case gauge: Checks case dimensions to ensure proper formation after resizing.
- Chronograph: Measures muzzle velocity for accurate load development.
Safety Precautions
- Always wear safety glasses and hearing protection.
- Never exceed maximum recommended loads.
- Inspect your loaded ammunition carefully before use.
- Properly dispose of any damaged or questionable ammunition.
- Understand and follow all safety guidelines in your reloading manual.
This comprehensive guide provides a starting point for reloading the .280 Ackley Improved. Remember, responsible and careful reloading practices are essential for safe and enjoyable shooting. Always prioritize safety and consult your reloading manual before attempting to reload any ammunition. This information is purely for educational purposes and should not be considered professional advice.
