CZ 527 American 300 Blackout Review

Published on August 4, 2019
Duration: 11:21

This review of the CZ 527 American in .300 Blackout, presented by Joel Wise of Precision Rifle Network, details its technical specifications and performance. The rifle features a Mini Mauser style bolt action, a 16.5-inch cold hammer-forged barrel with a 1:7 twist, and a versatile set trigger. Testing focused on accuracy with both subsonic and supersonic ammunition at 50 and 100 yards, revealing a strong preference for subsonic loads.

Quick Summary

The CZ 527 American in .300 Blackout excels with subsonic ammunition, achieving sub-MOA accuracy at 50 yards (0.31" with Sellier & Bellot 200gr). It features a Mini Mauser bolt action, 16.5" cold hammer-forged barrel with a 1:7 twist, and a set trigger adjustable to 1 pound. Supersonic ammo showed poor performance at 100 yards.

Chapters

  1. 00:03Introduction: CZ 527 American .300 Blackout
  2. 00:14Review Overview & Testing Plan
  3. 00:31Set Trigger & Accuracy Test Setup
  4. 00:57Action & Barrel Details
  5. 01:25Stock, Weight, LOP & Safety
  6. 01:56Magazine & Set Trigger Benefits
  7. 02:25Subsonic Ammo Test: Sellier & Bellot
  8. 03:10Subsonic Ammo Test: Hornady Sub-X
  9. 03:41Trigger Pull Weight Test Introduction
  10. 04:07Standard Trigger Pull Measurement
  11. 04:49Set Trigger Pull Measurement
  12. 05:32Trigger Pull Summary & Standard Test Results
  13. 06:20Set Trigger Test Results
  14. 06:41Subsonic Trigger Test Conclusion
  15. 07:11Supersonic Ammo Test: Magtech (Attempt 1)
  16. 07:51Supersonic Ammo Test: Magtech (Attempt 2)
  17. 08:27Supersonic Ammo Test: PNW Arms
  18. 09:05Supersonic Test Conclusion & Paradox
  19. 09:33Subsonic Re-test at 100 Yards
  20. 10:26Final Accuracy Summary & Conclusion
  21. 10:39Outro & Sponsors

Frequently Asked Questions

What are the key features of the CZ 527 American in .300 Blackout?

The CZ 527 American in .300 Blackout features a reliable Mini Mauser style bolt action, a 16.5-inch cold hammer-forged barrel with a 1:7 twist, a black polymer stock, and a two-position safety. It also includes a 5-round detachable box magazine and a highly adjustable set trigger.

How accurate is the CZ 527 American .300 Blackout with subsonic ammunition?

The rifle demonstrated excellent accuracy with subsonic ammunition, achieving a 0.31-inch group (0.59 MOA) with Sellier & Bellot 200gr at 50 yards and a 0.67-inch group (1.27 MOA) with Hornady 190gr Sub-X at 50 yards. Subsonic ammo also performed well at 100 yards.

What was the performance of supersonic ammunition in the CZ 527 American .300 Blackout?

Supersonic ammunition, including Magtech and PNW Arms 147gr FMJ, performed poorly at 100 yards, resulting in wide group dispersions. The rifle appears to strongly prefer subsonic ammunition for accuracy.

What is the trigger pull weight on the CZ 527 American?

The CZ 527 American features a set trigger system. The standard trigger pull measured around 3.5 to just under 4 pounds, while the set trigger could be adjusted to a crisp 1-pound pull weight.

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