MEC Bushing Chart for Alliant Powders: A Guide to Accurate Reloading

Introduction

A Foundation for Precision

The art of reloading ammunition is a blend of precision, passion, and a deep respect for the tools and processes involved. At its heart lies the pursuit of accuracy, consistency, and, for many, a significant cost savings over commercially available rounds. Achieving these goals requires meticulous attention to detail, and one of the most critical aspects of reloading is the precise measurement of powder charges. If you’re using a MEC reloading press and the popular Alliant powders, understanding the MEC bushing chart is paramount. This article serves as your guide to navigating this important aspect of reloading, ensuring your reloads are as safe and reliable as possible.

The Role of MEC Presses

MEC reloading presses have earned a reputation for their ruggedness, dependability, and ease of use. They are a staple in many reloading rooms, particularly among shotgun and metallic cartridge reloaders. The simplicity of their design, combined with their robust construction, makes them a favorite for reloaders of all experience levels. At the core of their operation is the ability to consistently meter powder, and this is where the MEC bushing chart comes into play.

Understanding the Chart’s Value

The MEC bushing chart is a valuable resource, acting as a starting point for determining the approximate amount of powder dispensed by a specific bushing size. By providing a list of bushing numbers alongside estimated powder charges, the chart helps you get close to the desired load for your chosen powder and caliber. However, it is crucial to understand that the MEC bushing chart is not an absolute guarantee. The actual powder charge can vary based on factors such as powder density, the type of powder, and even environmental conditions. That’s why the chart is a starting point, and using a scale is essential. This is not a shortcut.

Article Purpose and Scope

This guide focuses on the synergy between MEC presses and Alliant powders. Alliant is a name synonymous with quality and performance in the world of propellants. From its classic Red Dot to its cutting-edge Reloder series, Alliant offers a comprehensive range of powders for a diverse array of reloading applications. This article will provide you with the information necessary to navigate the MEC bushing chart, helping you to choose the right bushings, understand powder charges, and reload safely and effectively with Alliant powders. It is important to emphasize that every reloader must start by consulting published load data. Always verify all charges with a digital scale before starting a reloading session.

Understanding How MEC Bushings Work

Volumetric Measurement Explained

MEC bushings operate on the principle of volumetric measurement. They are cylindrical inserts with a pre-determined internal volume. As powder flows through the bushing, it fills the space, and when the press cycles, the bushing meters out that volume of powder. The size of the bushing, designated by a number, determines the amount of powder dispensed. A larger bushing allows for a greater volume and, consequently, a heavier charge, while a smaller bushing dispenses a smaller amount.

Limitations of Volume

However, the reliance on volume has its limitations. Powder, unlike liquids, is not a uniform substance. Its density can vary depending on factors such as the manufacturing process, temperature, and even the settling of the powder. Because of this variability, the same bushing size may dispense slightly different weights of powder depending on the batch and type. This is why it’s important to understand that the MEC bushing chart provides estimations, and the only way to know the exact powder charge is to weigh it with a scale.

Bushing Numbering and Weight

MEC bushings are typically numbered, with higher numbers generally corresponding to larger volumes and higher powder charges. The precise relationship between the bushing number and the powder charge is unique to each powder and caliber. That’s why using the MEC bushing chart as a starting point and checking with a scale is so important.

Alliant Powder: An Overview

The Significance of Alliant

Alliant Powder is a cornerstone in the reloading world, recognized for its wide range of quality propellants. They produce powders suitable for almost every reloading application, from small-caliber handgun loads to large-bore rifle cartridges and shotgun shells. Alliant’s commitment to innovation and performance has made it a favorite of reloaders seeking accuracy, reliability, and value.

Powder Variety and Applications

Alliant offers many different powders, with each offering unique characteristics suitable for different applications. Alliant powders are known for their consistent performance. However, it’s crucial to remember that all powders are designed for specific uses and should be used only as directed in load data.

Safety First

Before reloading, be sure to check Alliant’s website for current load data. This is the definitive source for safe and effective reloading. Consulting other reliable sources like reloading manuals is essential as well.

MEC Bushing Chart Tables for Alliant Powders

*Remember to always use this information as a guide only and to always verify powder charges with a digital scale. Never exceed the maximum load data.*

Red Dot

Red Dot is a versatile, fast-burning powder, often used for shotgun target loads and some lighter handgun loads. Its economical performance has made it a favorite among budget-conscious reloaders. Red Dot is known for its cleanliness, good metering characteristics, and reliable ignition.

Suitable Applications:

12-gauge and 20-gauge target loads; some light-recoiling handgun loads (e.g., .45 ACP, 9mm Luger).

Table:

(Remember, these are estimates!)

Important Reminder:

Always verify the powder charge with a digital scale!

Specific Considerations:

Red Dot is a flake powder, so consistent metering is important. Ensure your press is cycling smoothly, and avoid excessive static electricity, which can affect powder flow. Red Dot also has a slightly higher powder density and is known to vary from batch to batch, so checking with a scale is very important.

Unique

Unique is another versatile powder, well-suited for both handgun and shotshell applications. It is known for its medium burn rate, making it a good choice for a wide range of calibers and load weights. Its all-around capabilities have made it a popular choice.

Suitable Applications:

Handgun (e.g., .38 Special, .357 Magnum, .45 ACP) and some shotgun loads.

Table:

(Remember, these are estimates!)

Important Reminder:

Always verify the powder charge with a digital scale!

Specific Considerations:

Unique is a flake powder, so consistency in metering is crucial. Regular weighing is especially important to account for density variations.

Blue Dot

Blue Dot is a slower-burning powder often used in magnum handgun loads and some heavier shotshell loads. It provides higher velocities and is known for its good performance in these applications.

Suitable Applications:

Magnum handgun loads (e.g., .357 Magnum, .44 Magnum, .41 Magnum) and heavier shotshell loads.

Table:

(Remember, these are estimates!)

Important Reminder:

Always verify the powder charge with a digital scale!

Specific Considerations:

Blue Dot is a versatile powder, but it requires careful attention to load data, as improper charges can lead to excessive pressures. Always start with a light load and work up cautiously.

Power Pistol

Power Pistol is a fast-burning, spherical powder designed primarily for high-performance handgun loads. It is known for its clean-burning characteristics and high velocities.

Suitable Applications:

High-performance handgun loads (e.g., 9mm Luger, .40 S&W, .45 ACP).

Table:

(Remember, these are estimates!)

Important Reminder:

Always verify the powder charge with a digital scale!

Specific Considerations:

Power Pistol’s spherical shape provides excellent metering characteristics. However, it burns hotter than flake powders, so use the recommended load data to stay safe.

Reloder 7

Reloder 7 is a medium-burning powder ideal for various rifle cartridges. It’s a good choice for cartridges like the .223 Remington.

Suitable Applications:

Rifle cartridges, such as the .223 Remington

Table:

(Remember, these are estimates!)

Important Reminder:

Always verify the powder charge with a digital scale!

Specific Considerations:

Reloder 7 is a medium-burning powder so it’s important to follow published load data.

Reloder 15

Reloder 15 is a medium-slow burning powder that excels in a variety of rifle calibers, especially .308 Winchester.

Suitable Applications:

Rifle cartridges, such as the .308 Winchester.

Table:

(Remember, these are estimates!)

Important Reminder:

Always verify the powder charge with a digital scale!

Specific Considerations:

Reloder 15 is a medium-slow burning powder so it’s important to follow published load data.

Steel

Steel powder, specifically designed for high-performance shotshell loads, is known for its efficiency and high velocities.

Suitable Applications:

High-performance shotshell loads, particularly steel shot loads.

Table:

(Remember, these are estimates!)

Important Reminder:

Always verify the powder charge with a digital scale!

Specific Considerations:

Steel powder should be used for shotshells. Steel powder has specific burn characteristics so following load data is imperative for safe reloading.

Using the MEC Bushing Chart and Reloading Safely

Step-by-Step Guidance

Using the MEC bushing chart correctly involves several steps. First, select a bushing that, according to the chart, will dispense an estimated powder charge close to what your load data recommends. Install the bushing in your MEC press. Next, cycle the press and weigh the powder charge from the bushing on a digital scale. This initial weight is crucial. Adjust the bushing if necessary, or select a different bushing to achieve the desired charge, weighing each time.

Emphasis on Safety

Ensure you are always working from published load data and working up your loads slowly. Start with the minimum recommended powder charge and gradually increase it, weighing each charge. Watch for signs of excessive pressure such as flattened primers or difficult extraction. Make sure to check the reloaded rounds for proper seating and crimp, and never double-charge a case. This is a serious safety violation.

Required Equipment

Reloading requires the correct equipment, including a digital scale, safety glasses, and suitable workspace. A reloading bench with ample space for supplies and equipment is essential.

Troubleshooting

Addressing Inconsistency

Powder charge inconsistency can be frustrating. Several factors can cause these problems. Powder bridging, where powder clumps or hangs up in the bushing, can lead to inconsistent charges. Static electricity can cause powder to cling to the bushing, further affecting the amount metered. Wear and tear on the bushing can affect its metering abilities.

Solutions and Preventative Measures

The first solution is to ensure the press is set up correctly and working smoothly. Check for any obstructions in the bushing. Using a powder baffle can sometimes help, by creating a more uniform flow.

External Factors

Temperature and humidity can also influence powder charges. In extreme temperatures, powder density may vary. It is a good idea to reload when temperatures and humidity are stable.

Conclusion

Recap of Key Points

Using the MEC bushing chart is an integral aspect of using Alliant powders. While it provides a useful starting point, always remember that it is a guide, not a guarantee. Always verify all powder charges with a digital scale before reloading.

Importance of Safe Practices

Reloading is a rewarding pursuit. By following these guidelines, you can reload Alliant powders safely and accurately, achieving consistent performance with every round. Always prioritize safety and adhere to published load data. Reload safely, and enjoy the precision and satisfaction that comes with reloading your own ammunition.

Disclaimer

Essential Warnings

This article provides general information and is intended for educational purposes only. The information provided here is not a substitute for professional instruction or guidance. Always verify all load data with published manuals and reliable sources. The author is not responsible for any injuries, damages, or consequences resulting from reloading. Always exercise extreme caution and follow all safety precautions when reloading ammunition. Use this information at your own risk.