The 10mm Auto cartridge, known for its potent stopping power and versatility, has garnered a dedicated following among handloaders. This guide focuses specifically on load data for the 10mm using the Longshot powder, providing you with the information you need to safely and effectively reload this powerful round. Always remember to consult your specific reloading manual before attempting any reloading procedures. This information is for educational purposes only and should not be considered a substitute for proper training and adherence to safety guidelines.
Understanding Longshot Powder in 10mm Auto Loads
Longshot is a relatively slow-burning extruded powder known for its excellent performance in larger pistol cartridges like the 10mm. Its characteristics often lead to lower pressures and consistent velocities, making it a popular choice for those seeking accurate and reliable loads. However, its slower burn rate means it's less suitable for shorter barrels.
Advantages of Using Longshot in 10mm:
- Reduced Recoil: Compared to faster-burning powders, Longshot can produce less felt recoil, improving shooter comfort and follow-up shots.
- Improved Accuracy: Its consistent burn rate contributes to better accuracy and tighter groups.
- Lower Pressure: Often, Longshot produces lower pressures than other powders at similar velocities, promoting longer barrel life.
Disadvantages of Using Longshot in 10mm:
- Not Ideal for Short Barrels: Its slower burn rate may not fully utilize the shorter barrels found in some 10mm pistols, potentially leading to reduced velocity.
- Metering: Some loaders have found Longshot can be slightly challenging to meter consistently depending on your powder measure.
Sample 10mm Auto Longshot Load Data
Disclaimer: The following load data is for informational purposes only. This data is not exhaustive, and you must always refer to your reloading manual and manufacturer's specifications for the most up-to-date and accurate information. Never exceed the maximum recommended load listed in your manual.
This table provides example load data. Variations in bullets, primers, and equipment can significantly impact pressure and velocity.
| Bullet Weight (grains) | Bullet Type | Powder (grains) | Primer | COL (inches) | Velocity (fps) (Approximate) | Pressure (psi) (Approximate) | Notes |
|---|---|---|---|---|---|---|---|
| 180 | Jacketed Hollow Point | 8.0 | CCI 300 | 1.250 | 1050 | 28,000 | Starting Load |
| 180 | Jacketed Hollow Point | 8.5 | CCI 300 | 1.250 | 1100 | 30,000 | |
| 180 | Jacketed Hollow Point | 9.0 | CCI 300 | 1.250 | 1150 | 32,000 | Max Load (Example - Verify in your manual) |
| 200 | Jacketed Hollow Point | 8.2 | CCI 300 | 1.260 | 1000 | 27,000 | Starting Load |
| 200 | Jacketed Hollow Point | 8.8 | CCI 300 | 1.260 | 1050 | 30,000 | |
| 200 | Jacketed Hollow Point | 9.2 | CCI 300 | 1.260 | 1100 | 32,000 | Max Load (Example - Verify in your manual) |
COL: Cartridge Overall Length. This measurement is critical for safe and reliable functioning of your ammunition. Always double-check your COL to ensure proper chambering.
Note: These are example values only. Always work up to your maximum load gradually, carefully monitoring pressure signs.
Safety Precautions: Reloading 10mm with Longshot
- Read Your Manual: Consult your reloading manual meticulously before starting.
- Start Low, Go Slow: Begin with the minimum recommended load and gradually increase the powder charge, carefully monitoring for pressure signs.
- Check Your Work: Double-check your measurements and ensure that all components are correctly seated.
- Use a Reliable Scale: Invest in a quality powder scale to ensure accurate powder charges.
- Proper Equipment: Ensure you have the appropriate reloading tools and dies for the 10mm Auto cartridge.
- Wear Safety Glasses: Always wear safety glasses or protective eyewear while reloading.
- Cleanliness: Maintain a clean and organized workspace to prevent accidents.
By following these guidelines and consulting your reloading manual, you can safely and effectively load 10mm Auto ammunition using Longshot powder. Remember, responsible reloading practices are paramount for ensuring the safety of yourself and others. Enjoy the process and always prioritize safety.
