Finding reliable load data for cast bullets in 300 Blackout can be tricky. Factory ammo typically uses jacketed bullets, leaving many reloaders unsure where to start. This comprehensive guide delves into the specifics of loading cast bullets in 300BLK, covering everything from bullet selection to safety precautions. We'll explore various bullet weights, powder choices, and loading techniques to help you achieve accurate and safe results. Remember, always double-check your load data with multiple sources before loading.
Understanding 300BLK and Cast Bullets
The 300 Blackout cartridge, known for its versatility, is popular for both subsonic and supersonic applications. Cast bullets offer a cost-effective alternative to jacketed bullets, especially for plinking and practice. However, their softer lead composition requires careful consideration when choosing powders and velocities. Using the wrong load data can lead to dangerous pressure spikes and potentially damage your firearm.
Key Considerations for Cast Bullet Loads:
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Bullet Hardness: A critical factor. Too soft a bullet will deform in the barrel, leading to inaccurate shots and potentially fouling. A minimum Brinell Hardness Number (BHN) of 12 is generally recommended for 300BLK. Higher BHN values (up to 18) are preferable for supersonic loads.
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Lubrication: Proper lubrication is essential to prevent leading. Use a high-quality cast bullet lubricant designed for the expected velocities. Size and lube your bullets consistently. Inconsistent sizing or lubrication can impact accuracy.
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Powder Selection: Choose powders known for their suitability with cast bullets. Powders like Unique, Titegroup, and Power Pistol are frequently used, but always refer to published load data. Avoid powders that are too fast-burning, as these can lead to excessive pressure.
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Velocity: Keep velocities within the safe operating limits for your chosen bullet and powder combination. Exceeding recommended velocities can cause dangerous pressure surges.
Load Data Examples (Disclaimer: This data is for informational purposes only. Always consult multiple reloading manuals and verify load data before loading. )
The following table provides example load data. This is not a recommendation and should not be used without further verification from reputable sources. Always start at the minimum charge weight and work your way up, carefully monitoring pressure signs.
| Bullet Weight (grains) | Bullet Type | Powder | Powder Charge (grains) | COL (inches) | Notes |
|---|---|---|---|---|---|
| 150 | Round Nose | Unique | 6.0 - 7.0 | 2.260 | Start low, work up |
| 158 | Round Nose | Titegroup | 4.0 - 5.0 | 2.250 | Subsonic load |
| 180 | Round Nose | Power Pistol | 7.0 - 8.0 | 2.240 | Supersonic load |
COL (Cartridge Overall Length): This refers to the total length of the loaded cartridge. It is crucial to measure this precisely to ensure safe and reliable function.
Understanding Pressure Signs:
While working up a load, carefully monitor for signs of excessive pressure, including:
- Difficult Bolt Operation: Sticking or difficult closing of the bolt.
- Excessive Primer Flow: Primer material flowing out of the primer pocket.
- Unusual Sounds: Loud or unusual sounds during firing.
- Bullet Setback: Bullets that are set back into the case.
If you observe any of these signs, immediately stop loading and reduce the powder charge.
Bullet Selection and Preparation
Choosing the right cast bullet is essential for success. Consider these factors:
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Weight: Bullet weight influences velocity and energy. Heavier bullets generally travel slower but retain more energy.
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Shape: Round nose (RN) bullets are common for cast bullets. However, other designs are also available.
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Hardness: As discussed earlier, bullet hardness is crucial for preventing leading.
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Lubrication: Ensure bullets are properly lubricated with a suitable lubricant for your chosen powder and velocity.
Proper bullet preparation involves:
- Sizing: Size the bullets using a suitable sizing die.
- Lubrication: Apply a lubricant evenly to the bullets.
- Inspecting: Inspect each bullet for flaws before loading.
Conclusion
Loading cast bullets in 300BLK can be a rewarding experience, providing a cost-effective way to enjoy shooting. However, it's critical to prioritize safety and accuracy. Always use reliable load data from multiple sources, start at the minimum charge weight, and carefully monitor for pressure signs. Remember, reloading is a skill that takes time and practice to master. Start slowly, be meticulous, and always prioritize safety above all else. Happy reloading!