Introduction:
IMR 4198 is a popular, versatile propellant known for its excellent accuracy and performance across a wide range of cartridges. This comprehensive guide delves into IMR 4198 load data, providing essential information for safe and effective reloading. We'll cover various calibers, bullet weights, and other crucial factors to ensure you're loading safely and achieving optimal results. Remember, always consult your firearm's owner's manual and other reputable load data sources before beginning any reloading process. This information is for educational purposes only and should not be considered definitive load data.
Understanding IMR 4198
IMR 4198 is a medium-burning, extruded powder. This means it burns at a moderate rate, making it suitable for a variety of applications. Its versatility is a key reason for its popularity among reloaders. It performs well in both pistol and rifle cartridges, offering consistent accuracy and velocity. The extruded nature contributes to its uniform burn rate, leading to improved precision.
Key Characteristics of IMR 4198:
- Burn Rate: Medium
- Powder Type: Extruded
- Applications: Pistol and Rifle Cartridges
- Known for: Accuracy and Versatility
IMR 4198 Load Data for Popular Calibers
This section provides a general overview of IMR 4198 load data for several popular calibers. Crucially, this is not a substitute for consulting your own reloading manuals and sources. Always double-check data from multiple, reputable sources.
.223 Remington/.556 NATO Load Data
| Bullet Weight (grains) | IMR 4198 (grains) | Velocity (fps) (Approximate) | Notes |
|---|---|---|---|
| 55 | 24.0 | 3100 | Start Low, Work Up |
| 55 | 25.5 | 3200 | |
| 62 | 23.0 | 2900 | |
| 62 | 24.5 | 3000 | |
| 77 | 21.0 | 2700 | |
| 77 | 22.5 | 2800 |
Important Note: These are approximate values and can vary based on various factors such as case capacity, bullet type, and environmental conditions. Always start at the minimum charge and work up gradually, carefully monitoring pressure signs.
9mm Luger Load Data
| Bullet Weight (grains) | IMR 4198 (grains) | Velocity (fps) (Approximate) | Notes |
|---|---|---|---|
| 115 | 4.5 | 950 | Start Low, Work Up |
| 115 | 5.0 | 1000 | |
| 124 | 4.0 | 900 | |
| 124 | 4.5 | 950 | |
| 147 | 3.5 | 850 | |
| 147 | 4.0 | 900 |
Important Note: 9mm loads using IMR 4198 often require careful attention to case volume and seating depth. Start with minimal charges and increase gradually while monitoring for pressure signs. This powder is less commonly used in 9mm than others but can be effective.
.308 Winchester Load Data
| Bullet Weight (grains) | IMR 4198 (grains) | Velocity (fps) (Approximate) | Notes |
|---|---|---|---|
| 150 | 43.0 | 2500 | Start Low, Work Up |
| 150 | 44.5 | 2600 | |
| 168 | 41.0 | 2400 | |
| 168 | 42.5 | 2500 | |
| 180 | 39.0 | 2300 | |
| 180 | 40.5 | 2400 |
Important Note: .308 Winchester loads require meticulous attention to detail and should only be undertaken by experienced reloaders. Always use a calibrated scale and consistently measure your powder charges.
Safety Precautions
Reloading is inherently dangerous. Failure to follow safety procedures can result in serious injury or death. Always adhere to these essential safety precautions:
- Consult multiple loading manuals: Never rely on a single source.
- Start low, work up: Begin with the minimum recommended charge and gradually increase, meticulously observing pressure signs.
- Use a calibrated powder scale: Ensure accurate powder measurements.
- Wear safety glasses and hearing protection: Protect your eyes and ears.
- Properly lubricate cases: Ensure consistent case sizing.
- Inspect your ammunition: Check for any defects before firing.
- Never load more than the maximum recommended charge: Overloading can lead to catastrophic failures.
Conclusion
IMR 4198 offers reloaders a versatile and accurate propellant for a range of calibers. By understanding its characteristics, consulting multiple load data sources, and following strict safety procedures, you can safely and effectively use IMR 4198 to create high-quality ammunition. Remember, reloading is a serious responsibility, and safety should always be your top priority. Always refer to your reloading manual and consult with experienced reloaders if you have any questions. This information is for educational purposes only and should not be taken as definitive load data. Always double-check your loads with reputable sources.