Hebrew Hammer? 5.56mm IMI 77gr OTM 10.5" Gel Test

Published on November 15, 2019
Duration: 4:18

This expert-level analysis details the terminal ballistics of IMI's 77-grain OTM 5.56mm ammunition, often considered a clone of the Mark 262. Fired from a 10.5-inch barrel into ballistic gelatin, the ammunition demonstrated significant fragmentation and a substantial temporary stretch cavity, achieving an average velocity of 2367 FPS. The test highlights its performance characteristics, including deep penetration, while cautioning against its use if over-penetration is a primary concern.

Quick Summary

IMI's 77gr OTM 5.56mm ammunition, a Mark 262 clone, demonstrated deep penetration (19.5 inches) and significant fragmentation when fired from a 10.5-inch barrel. It achieved an average velocity of 2367 FPS with a substantial temporary stretch cavity, making it effective but potentially unsuitable if over-penetration is a primary concern.

Chapters

  1. 00:03Ammunition Introduction: IMI 77gr OTM
  2. 00:10Ammunition Details: Sierra Match King Bullet
  3. 00:26Test Setup: 10.5" Barrel & Gelatin
  4. 00:41Live Fire Test in Desert
  5. 00:54High-Speed Gel Impact Analysis
  6. 01:19Ballistic Gel Measurements: Cavity & Penetration
  7. 01:54Fragment Recovery and Observations
  8. 02:03Velocity Data Analysis (FPS)
  9. 02:28Gel Block Exit View
  10. 02:37Performance Summary: Fragmentation & Cavity
  11. 03:25Penetration Discussion & Load Recommendation

Frequently Asked Questions

What are the terminal ballistic characteristics of IMI's 77-grain OTM 5.56mm ammunition when fired from a 10.5-inch barrel?

IMI's 77gr OTM 5.56mm ammunition, a Mark 262 clone, demonstrated deep penetration (19.5 inches) in ballistic gelatin. It created a significant temporary stretch cavity (7"x3") and extensive fragmentation of the bullet core and jacket, indicating effective terminal performance.

What was the average velocity of the IMI 77gr OTM 5.56mm ammunition during the ballistic gel test?

During the test with a 10.5-inch barrel, the IMI 77gr OTM 5.56mm ammunition achieved an average velocity of 2367 FPS. Individual shot velocities ranged from 2212 FPS to 2436 FPS, with a standard deviation of 89.93.

How does the IMI 77gr OTM 5.56mm ammunition compare to the military's Mark 262?

The IMI 77gr OTM 5.56mm ammunition is considered a clone of the military's Mark 262. Both utilize a 77-grain Sierra Match King bullet and are expected to perform similarly in terms of terminal ballistics, including expansion and fragmentation.

Is IMI's 77gr OTM 5.56mm ammunition suitable for situations where deep penetration is a primary concern?

While the IMI 77gr OTM 5.56mm ammunition achieved a deep penetration of 19.5 inches in the test, the presenter advises against this load if deep penetration is a primary concern. This suggests it may fragment significantly, potentially limiting its penetration capabilities in certain scenarios.

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