M855 vs. M193: Which 5.56 Round Is The Best?

Published on October 29, 2021
Duration: 15:10

This video compares M855 and M193 5.56mm ammunition, detailing their history, velocity, and terminal ballistics through gel tests. M855, a 62-grain green tip round, offers better penetration and long-range accuracy but requires faster twist rates. M193, a 55-grain FMJ, is generally more accurate at short ranges and often cheaper, though it shows less penetration. Both are effective military rounds, but superior commercial self-defense options exist.

Quick Summary

M855 (62gr green tip) offers superior barrier penetration and long-range accuracy compared to M193 (55gr FMJ). M193 is generally cheaper and more accurate at short ranges. M855 requires faster twist rates (1:7 or 1:8) and showed deeper penetration in gel tests with delayed fragmentation.

Chapters

  1. 00:00Introduction: M855 vs M193 History
  2. 01:47Velocity Testing: 16" & 11.5" Barrels
  3. 03:16Ballistic Gel Terminal Performance
  4. 07:25Pros and Cons: Penetration, Accuracy, Cost
  5. 11:16Conclusion & Twist Rate Requirements

Frequently Asked Questions

What are the key differences between M855 and M193 5.56mm ammunition?

M193 is a 55-grain FMJ round, while M855 is a heavier 62-grain 'green tip' round with a steel penetrator. M855 offers better barrier penetration and long-range accuracy, whereas M193 is often cheaper and performs well at closer ranges.

How do M855 and M193 perform in ballistic gel tests?

M855 typically shows deeper penetration but delayed fragmentation. M193 can exhibit more violent reactions upon impact but may also fragment later in some tests, showing less overall penetration compared to M855.

What are the velocity differences between M855 and M193?

From a 16-inch barrel, M193 averaged around 3,055 FPS, slightly faster than M855's average of 2,997 FPS. Shorter barrels show a similar trend, with M193 maintaining a velocity advantage.

Does M855 require a specific barrel twist rate?

Yes, the longer and heavier M855 projectile requires a faster barrel twist rate, typically 1:7 or 1:8 inches, to ensure proper stabilization during flight for optimal accuracy.

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