Testing NEW 300 Blackout Subsonic Ammunition

Published on July 22, 2018
Duration: 6:56

This video tests new Fiocchi 300 Blackout subsonic ammunition, specifically 220-grain boat tail hollow points. Chronograph data was collected from both a 16-inch barrel and a short-barreled rifle (SBR), revealing minimal velocity differences between the two despite an 8-inch barrel length disparity. The presenter notes that the powder appears to be optimized for shorter barrels, with potential for short-stroking issues in SBRs with certain buffer setups.

Quick Summary

Fiocchi 300 Blackout subsonic ammunition features 220-grain boat tail hollow points rated for approximately 1020 fps. Testing revealed minimal velocity differences between 16-inch and 8-inch barrels, suggesting efficient powder burn in shorter lengths. Potential short-stroking in SBRs with certain buffers was noted, indicating a need for buffer system optimization.

Chapters

  1. 00:00Introduction and Weather Conditions
  2. 00:16Introducing Fiocchi Subsonic 300 Blackout
  3. 00:55Ammunition Appearance and OAL Comparison
  4. 01:57Chronograph Setup and Testing Plan
  5. 02:11Chronograph Results (16-inch Barrel)
  6. 02:37Chronograph Results (SBR)
  7. 03:01Analysis of Velocity Data
  8. 03:45Comparison with Other Ammunition
  9. 04:51Free State Munitions Hush Comparison
  10. 05:24Reliability Issues with SBR
  11. 05:45Buffer System Analysis
  12. 06:06Conclusion and Future Testing

Frequently Asked Questions

What are the specifications of the Fiocchi 300 Blackout subsonic ammunition tested?

The Fiocchi 300 Blackout subsonic ammunition tested features 220-grain boat tail hollow points. It is rated for approximately 1020 feet per second and is designed to remain subsonic under various environmental conditions.

How does barrel length affect the velocity of Fiocchi 300 Blackout subsonic rounds?

In testing, the velocity difference between a 16-inch barrel and an 8-inch short-barreled rifle (SBR) was minimal. This suggests that the powder charge in this specific load is largely consumed within the first eight inches of barrel.

What potential reliability issues were observed with Fiocchi subsonic 300 Blackout in an SBR?

The presenter noted occasional short-stroking in an SBR, leading to failures to lock back on an empty magazine and issues picking up rounds. This was linked to the buffer system, specifically an H buffer, and suggested a need for optimization.

Are Fiocchi 300 Blackout subsonic rounds optimized for specific barrel lengths?

Fiocchi indicates that these subsonic rounds are optimized for use in a 16-inch barrel. However, the testing showed comparable performance in an 8-inch barrel under the tested conditions, with the primary concern being potential short-stroking in shorter barrels.

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