223 vs 6.5 Grendel vs 300 BO vs 7.62x39 vs 350 Legend: Steel Penetration Test

Published on February 14, 2023
Duration: 9:26

This guide details a comprehensive steel penetration test comparing five popular AR-15 compatible cartridges: .223 Remington, 6.5 Grendel, .300 Blackout, 7.62x39, and .350 Legend. The test involves precise setup, chronograph readings, and crater depth measurements to determine which caliber offers superior performance against steel targets. The analysis highlights the importance of bullet construction and barrel length in achieving penetration.

Quick Summary

The 6.5 Grendel proved to be the most effective caliber for penetrating 3/8 inch mild steel in this test, achieving a crater depth of 0.209 inches. It surpassed .350 Legend, 7.62x39, and .223 Remington. The .300 Blackout failed to penetrate the 1/4 inch steel plate.

Chapters

  1. 00:00Caliber Introduction
  2. 00:21Test Setup and Equipment
  3. 00:53Velocity and Energy Testing
  4. 02:491/4 Inch Mild Steel Test
  5. 05:183/8 Inch Mild Steel Test
  6. 07:53Final Measurements and Conclusion

Frequently Asked Questions

Which AR-15 caliber penetrates steel the best?

Based on a 3/8 inch mild steel test, the 6.5 Grendel demonstrated the deepest penetration (0.209 inches). It outperformed .350 Legend, 7.62x39, and .223 Remington in this specific test, though barrel length can influence results.

How does .300 Blackout perform against steel?

In a test against 1/4 inch mild steel, the .300 Blackout load (Barnes 120 gr HP) failed to penetrate, leaving only a significant dent. It did not achieve a pass-through on the thicker 3/8 inch plate either.

What is the purpose of a ballistic chronograph in ammunition testing?

A ballistic chronograph, like the MagnetoSpeed V3 used, measures the velocity of a projectile (in FPS) as it passes. This data is crucial for understanding actual ammunition performance, energy transfer, and comparing loads accurately, especially when actual velocities differ from advertised claims.

What factors influence bullet penetration through steel?

Bullet penetration through steel is influenced by several factors, including the caliber and bullet weight, the bullet's construction (e.g., jacketed, hollow point, solid), the velocity at impact, and the angle of impact. Thicker or hardened steel will also significantly resist penetration.

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