Introduction
The 260 Ackley Improved. Just the name itself conjures images of long-range precision, flatter trajectories, and the satisfying thud of a well-placed shot. This cartridge, born from the venerable 260 Remington, has carved a niche for itself among shooters who demand the absolute best in accuracy and performance. Whether you’re a seasoned long-range hunter, a competitive shooter looking to shave fractions of an inch off your groups, or a dedicated reloader seeking to optimize your ammunition, the 260 Ackley Improved offers a compelling combination of ballistic performance and reloading flexibility.
This article is designed to be your comprehensive guide to unlocking the full potential of the 260 Ackley Improved. We will explore the cartridge’s history, delve into its advantages, and, most importantly, provide detailed load data, safety guidelines, and practical reloading tips. Our goal is to equip you with the knowledge and resources you need to safely and effectively reload for this exceptional cartridge. This guide will navigate you through the complexities of bullet selection, powder choices, primer considerations, and case preparation.
The 260 AI’s transformation began with the 260 Remington, a cartridge known for its inherent accuracy and efficiency. However, the 260 Remington’s performance could be improved further. P.O. Ackley, the renowned wildcat cartridge creator, recognized the potential for enhancement. By re-chambering the 260 Remington with a sharper shoulder and slightly straighter case walls, Ackley created a cartridge that offered significant gains in velocity and performance. The result was the 260 Ackley Improved, a cartridge that would quickly gain a devoted following.
The benefits of choosing the 260 Ackley Improved are numerous. The increased case capacity, thanks to the improved design, allows for higher velocities compared to the standard 260 Remington. This translates to a flatter trajectory, which is crucial for long-range shooting and hunting. Coupled with the use of high ballistic coefficient (BC) bullets, the 260 AI excels at resisting wind drift and maintaining energy downrange. Shooters often find that the 260 AI can deliver impressive downrange performance, making it an excellent choice for those seeking extended range and superior accuracy.
This article’s primary purpose is to serve as a reliable resource for anyone reloading the 260 Ackley Improved. We will focus on providing specific load data for various bullet weights and powders, empowering you to develop safe and effective loads for your rifle. It is crucial to remember that safety is paramount. This guide is not intended to replace thorough research and responsible reloading practices. We strongly advise consulting multiple sources, including reputable reloading manuals, before starting any reloading operation.
Understanding the 260 Ackley Improved
To fully appreciate the 260 Ackley Improved, it is essential to grasp the underlying principles of its design and how it differentiates from the original 260 Remington. One of the first crucial aspects is to understand the chambering and dimensions of the cartridge. The 260 AI is not a factory-standard cartridge. It requires a custom chamber cut by a qualified gunsmith. The characteristic features of the 260 AI chamber include a sharper shoulder angle (typically 40 degrees) and minimal body taper. This configuration increases case capacity and maximizes the ballistic potential of the 6.5mm bullets.
The precise dimensions of the 260 AI chamber are critical for achieving optimal performance and maintaining safe operating pressures. Proper chambering helps to facilitate proper case expansion and ensure that the bullet is aligned correctly with the rifling. In addition, a properly chambered rifle will contribute greatly to accuracy and ease of extraction. Therefore, ensuring your rifle is chambered by a reputable gunsmith is the cornerstone of success with the 260 Ackley Improved.
Why choose the 260 Ackley Improved? The answer lies in the cartridge’s ability to generate higher velocities, thereby achieving a flatter trajectory. This gives shooters a significant advantage, especially when engaging targets at extended ranges. The flatter trajectory means that the bullet drops less over distance, which makes aiming and compensating for bullet drop much easier.
Furthermore, the 260 AI is known for its efficiency. It provides excellent ballistic performance with relatively moderate powder charges, leading to less recoil, allowing for quicker follow-up shots. Many shooters prefer the cartridge’s inherent accuracy and suitability for long-range endeavors. The 260 Ackley Improved’s trajectory characteristics and the wide range of high-quality bullets available make it an exceptional choice for everything from target shooting to varmint hunting, and even medium-sized game at the right ranges.
Several factors affect the performance of the 260 Ackley Improved. Barrel length and twist rate are essential to its ballistics. A longer barrel generally provides higher velocities due to increased powder burn time. The appropriate twist rate is also important, with faster twist rates typically stabilizing heavier, higher BC bullets. Bullet selection also plays a crucial role, as the ballistic coefficient is a significant determinant of long-range performance. Finally, the specific powder choice and burn rate also affect performance. Careful selection and calibration of your load is what will allow you to fine-tune and achieve optimal performance.
Safety First: Reloading Precautions
Safety must always be the top priority in reloading. Reloading can be a rewarding hobby, but it involves handling propellants and primers, which can be hazardous if not done correctly. To start, you must thoroughly understand the reloading process, including case preparation, priming, powder charging, and bullet seating.
Always Start Low
This is an essential rule. Always begin with the *minimum* recommended powder charge listed in a reliable reloading manual. Then, gradually increase the powder charge, one step at a time, while carefully monitoring for pressure signs. Never exceed the maximum charge stated in the manual. It is better to work up a load in several sessions, and to allow some time between reloads.
Reloading manuals are your primary sources of information. They provide specific load data for various cartridges, bullet weights, powders, and primers. Make sure you use the correct manual for the 260 Ackley Improved. Consult the manual regularly. Read the safety warnings, understand the loading tables, and pay attention to the pressure limits.
Recognize pressure signs, which are indicators that a load may be exceeding safe pressure levels. Common pressure signs include:
* Flattened primers
* Cratered primers
* Hard bolt lift
* Difficult extraction of the spent case
* Expansion of the case head
* Pressure rings on the case body
These can indicate that your load is generating excessive pressure. If you observe any of these signs, immediately stop loading, and either reduce the powder charge or consult a more experienced reloader or gunsmith.
Case preparation is critical for accuracy and safety. Full-length resizing is often recommended for the 260 Ackley Improved to ensure proper fit in the chamber. Trimming cases to the correct length is also a must, as this will maintain consistent neck tension on the bullet. Chamfering and deburring the case mouth are also important, as this makes bullet seating more consistent and reduces the risk of damage to the bullet or the case.
Bullet Selection and Performance
Choosing the right bullet is key to maximizing the 260 Ackley Improved’s performance. Bullet weight, construction, and ballistic coefficient (BC) are essential factors.
The 260 AI excels with a range of bullet weights, and many shooters have found success with bullets ranging from 120 to 150 grains. Lighter bullets generally achieve higher velocities but may be more affected by wind. Heavier bullets tend to retain more energy downrange and have greater resistance to wind deflection.
Ballistic coefficient is a key parameter. It measures a bullet’s ability to overcome air resistance. Higher BC bullets will have less wind drift and retain more velocity over long distances. A good BC is a critical attribute for long-range accuracy.
Bullet construction also matters. There are several common bullet types. Match bullets are precision-made for accuracy. Hunting bullets are designed for controlled expansion and effective terminal performance. Ballistic tips, which have polymer tips, help to initiate expansion. Bonded bullets are designed to maintain their integrity at impact, and are well-suited to larger game.
For the 260 Ackley Improved, here are a few bullets that are particularly well-suited.
Berger 140gr VLD Hunting
These bullets are famous for their exceptional ballistic coefficient and explosive terminal performance. They have a reputation for excellent accuracy and devastating results on game. Their design, combined with the velocity of the 260 AI, makes them a great choice for ethical hunting.
Hornady ELD-X
The Hornady ELD-X series is designed for both accuracy and controlled expansion. They are ideal for hunting game and deliver consistent performance across a range of distances.
Sierra MatchKing
The Sierra MatchKing is a well-known choice among target shooters, as it offers incredible precision and accuracy. They are less inclined to expand than hunting bullets.
Powder Selection
Choosing the correct powder for the 260 Ackley Improved is important. There are several powder options available on the market, and they all have unique characteristics.
Powders are classified based on their burn rate. Slow-burning powders are generally suitable for cartridges like the 260 Ackley Improved because they provide higher velocities and maximize the cartridge’s potential. Faster-burning powders may produce higher pressures before reaching optimal velocities.
Powder Recommendations
There are some powder recommendations for the 260 Ackley Improved:
* H4350: A widely popular powder and a top choice for many 6.5mm cartridges. It is known for its consistency and accuracy.
* Reloder 17: A fast-burning powder that delivers high velocities with reduced barrel temperatures. This powder can also improve the accuracy of your shots.
* IMR 4350: Another versatile powder that delivers good performance. It is a good option for those who have access to it.
* Varget: Another powder with excellent performance and is ideal for longer-range shooting.
Consider your barrel length, the bullet weight you plan to use, and the ambient temperature. Some powders are more sensitive to temperature than others.
Load Data
*Disclaimer*: *This load data is for informational purposes ONLY. Always start low and work up your loads cautiously, checking for pressure signs. The author is not responsible for any damage or injury resulting from reloading.*
* All data has been taken from reloading manuals.
To develop safe and accurate loads, start with the minimum recommended powder charges and carefully work your way up, monitoring for pressure signs.
Berger 140gr VLD Hunting
Primer: Federal 210M
H4350: Min Charge: 40.0 grains, Max Charge: 43.5 grains, Muzzle Velocity: 2800-2950 fps, COL: 2.800″
Reloder 17: Min Charge: 41.0 grains, Max Charge: 44.5 grains, Muzzle Velocity: 2850-3000 fps, COL: 2.800″
IMR 4350: Min Charge: 39.5 grains, Max Charge: 43.0 grains, Muzzle Velocity: 2770-2900 fps, COL: 2.800″
Hornady ELD-X
Primer: Federal 210M
H4350: Min Charge: 39.5 grains, Max Charge: 43.0 grains, Muzzle Velocity: 2750-2900 fps, COL: 2.800″
Reloder 17: Min Charge: 40.5 grains, Max Charge: 44.0 grains, Muzzle Velocity: 2800-2950 fps, COL: 2.800″
IMR 4350: Min Charge: 39.0 grains, Max Charge: 42.5 grains, Muzzle Velocity: 2720-2870 fps, COL: 2.800″
Sierra MatchKing
Primer: Federal 210M
H4350: Min Charge: 39.0 grains, Max Charge: 42.5 grains, Muzzle Velocity: 2700-2850 fps, COL: 2.800″
Reloder 17: Min Charge: 40.0 grains, Max Charge: 43.5 grains, Muzzle Velocity: 2750-2900 fps, COL: 2.800″
IMR 4350: Min Charge: 38.5 grains, Max Charge: 42.0 grains, Muzzle Velocity: 2670-2820 fps, COL: 2.800″
This is a sample of load data and should be used as a starting point only. Be diligent in your reloading process, and always work up your load gradually.
Primers and Brass
Primer selection is important in obtaining optimal ignition and performance. There are two types of primers, standard and magnum, and choosing the correct primer will affect how the powder burns. It is recommended to use the recommended primer in the reloading manual.
For the 260 AI, some recommended primers include:
* Federal 210M: A match-grade primer known for its consistent ignition.
* CCI BR2: A benchrest primer that can also be used to improve accuracy.
Brass selection is another factor. The quality of your brass significantly influences the consistency of your loads. Brass brands like Lapua and Peterson are known for their quality and are often preferred by serious reloaders.
Reloading Process: Step-by-Step Guide
Case Preparation:
1. Clean your brass thoroughly, using a tumbler or ultrasonic cleaner.
2. Full-length resize the brass to ensure proper fit in the chamber.
3. Trim the cases to the correct length, using a case trimmer.
4. Deburr the case mouths to remove any sharp edges.
5. Clean and uniform the primer pockets.
Priming:
1. Use a priming tool or reloading press to seat the primers into the primer pockets.
Powder Charging:
1. Use a powder measure to throw a charge slightly lower than your target load.
2. Weigh each charge on a digital scale.
3. Carefully pour the weighed powder into the case.
Bullet Seating:
1. Use a bullet seating die to seat the bullet to the proper depth, as specified in the reloading manual.
2. Measure the cartridge overall length (COL) to ensure it is within the recommended range.
3. Test loads for accuracy and pressure signs.
Troubleshooting and Tips
Dealing with pressure issues is one of the essential parts of reloading. If you encounter sticky bolt lift, flattened primers, or other signs of excessive pressure, it’s important to stop reloading immediately. Reduce the powder charge and try again.
Accuracy problems can be caused by several factors, including inconsistent powder charges, improper seating depth, and poor bullet selection.
Common Mistakes
Common mistakes include:
* Using the wrong reloading data
* Overcharging cases with powder
* Not inspecting cases regularly
* Not following safe practices
Tips for Optimal Performance
For optimal performance, consider these advanced reloading techniques:
* Neck-sizing your cases
* Measuring and sorting your bullets
* Adjusting the bullet seating depth to optimize accuracy
Resources and Further Reading
* Reloading Manuals:
* Lyman Reloading Handbook
* Nosler Reloading Guide
* Hodgdon Reloading Data Center
* Useful websites and forums:
* AccurateShooter.com
* The Reloading Room
* Video resources: A quick search of YouTube will yield many helpful videos.
Conclusion
The 260 Ackley Improved is a formidable cartridge, capable of delivering impressive accuracy and long-range performance. By following the guidelines in this article, you can safely and effectively reload for this exceptional cartridge. Remember, safety is paramount. Always work up your loads carefully, and consult multiple sources before beginning any reloading operation.
We hope this guide has provided you with valuable information. Remember, your experiences may vary. Please do not hesitate to ask for help, and enjoy your journey of reloading.
Disclaimer: *This load data is for informational purposes ONLY. Always start low and work up your loads cautiously, checking for pressure signs. The author is not responsible for any damage or injury resulting from reloading.*
