M855A1 vs M855 vs SS109 vs XM193: Crazy Results on Steel

Published on May 9, 2023
Duration: 9:23

This video provides an expert-level comparison of four common 5.56/.223 ammunition types (XM193, SS109, M855, and M855A1) tested for steel plate penetration. Using a custom bolt-action rifle and a MagnetoSpeed chronograph, Banana Ballistics objectively measures velocity and penetration depth, revealing significant differences in performance, especially against hardened AR500 steel. The M855A1 demonstrated superior penetration capabilities in mild steel, while all rounds struggled against AR500.

Quick Summary

Expert analysis comparing M855A1, M855, SS109, and XM193 ammunition reveals significant differences in steel plate penetration. M855A1 excels in mild steel, while all tested rounds failed to penetrate AR500 hardened steel, highlighting the importance of projectile design and material hardness.

Chapters

  1. 00:00Introduction and Ammo Overview
  2. 00:471/4 Inch Steel Plate Test
  3. 01:423/8 Inch Steel Plate Test
  4. 03:511/2 and 3/4 Inch Mild Steel Tests
  5. 06:22AR500 Hardened Steel Test
  6. 07:15Analysis and Measurements

Frequently Asked Questions

Which 5.56/.223 ammunition penetrates mild steel the best?

Based on testing, the M855A1 demonstrated the best penetration against mild steel plates, successfully piercing thicker sections where other rounds like XM193 failed. The M855 and SS109 also showed good performance, but M855A1 was the most effective overall in mild steel scenarios.

Can standard 5.56/.223 rounds penetrate AR500 hardened steel?

No, the testing showed that none of the common 5.56/.223 rounds, including M855A1, could penetrate a 3/8 inch AR500 hardened steel plate. They only managed to create surface craters, highlighting the extreme durability of AR500 armor.

What is the difference between M855 and SS109 ammunition?

While often grouped together, M855 and SS109 (both typically 62-grain projectiles) can exhibit different penetration depths due to manufacturing variations and velocity differences. Empirical testing, as shown in this video, is crucial to understand their specific performance characteristics.

How does XM193 perform against steel plates compared to military rounds?

XM193, a standard 55-grain FMJ round, showed the least penetration capability among the tested ammunition. It failed to penetrate a 3/8 inch mild steel plate, whereas the military-spec M855, SS109, and M855A1 were able to penetrate it.

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