5.56 vs 5.45x39 On Mild Steel: NOT So Similar After All?

Published on March 30, 2023
Duration: 9:01

This video provides a detailed comparison of 5.56x45mm NATO and 5.45x39mm cartridges, focusing on their penetration capabilities against mild steel targets. The host, demonstrating high expertise in ballistics testing, uses chronographs and precise measurements to analyze velocity, energy, and penetration depth. The M855 variant of the 5.56x45mm NATO cartridge showed superior performance in breaching thicker steel.

Quick Summary

Expert ballistics testing reveals that while both 5.56x45mm NATO and 5.45x39mm can penetrate 1/4 inch mild steel, the 5.56x45mm NATO M855 cartridge demonstrates superior performance against thicker 3/8 inch steel, nearly breaching the plate. Standard FMJ rounds for both calibers failed on the thicker target.

Chapters

  1. 00:00Introduction: 5.45x39 vs 5.56x45 NATO
  2. 00:27Test Setup: Steel Slid V2 Target
  3. 00:40Standard FMJ Velocity Testing
  4. 01:19Specialty Round Velocity Testing (7N6 vs M855)
  5. 02:001/4 Inch Mild Steel Penetration Results
  6. 03:423/8 Inch Mild Steel Penetration Results
  7. 06:19Post-Test Analysis: Steel Insert Examination
  8. 07:17Final Measurements and Conclusion

Frequently Asked Questions

How do 5.56x45mm NATO and 5.45x39mm cartridges compare in steel penetration?

In tests against 1/4 inch mild steel, both calibers penetrated. However, against 3/8 inch mild steel, the 5.56x45mm NATO M855 cartridge demonstrated superior performance, nearly breaching the plate, while standard FMJ rounds and the 5.45x39mm 7N6 failed to penetrate fully.

What were the velocity differences between 5.56 and 5.45 ammunition in the test?

Standard 5.56x45mm NATO 55gr FMJ averaged 3,039 fps, faster than the 5.45x39mm 60gr FMJ at 2,885 fps. Specialty rounds showed 5.45x39mm 7N6 reaching 3,079 fps, while 5.56x45mm NATO M855 averaged 2,982 fps from 16-inch barrels.

Which specific rounds performed best against thicker steel targets?

The 5.56x45mm NATO M855 (62gr penetrator) showed the best performance against 3/8 inch mild steel, nearly penetrating the plate. Its penetration depth was measured at 0.265 inches to the insert tip.

What was the outcome of the 5.45x39mm 7N6 round's penetration test?

The 5.45x39mm 7N6 round, despite its high velocity (3,079 fps), failed to penetrate the 3/8 inch mild steel plate. Interestingly, a recovered steel insert from this round showed surprising mushrooming, attributed possibly to heat or lower hardness.

More Reviews Videos You Might Like

More from Banana Ballistics

View all →