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

Published on November 15, 2019
Duration: 4:18

This video details a ballistic gel test of IMI's 77gr OTM ammunition, a clone of the Mk 262, fired from a 10.5-inch barrel. The test aimed to assess performance despite the shorter barrel. The results showed significant temporary stretch cavity and fragmentation, with a penetration depth of 19.5 inches. While effective, the instructor notes the penetration might be too deep for some applications.

Quick Summary

IMI's 77gr OTM 5.56mm ammunition, a Mk 262 clone, was tested in a 10.5-inch barrel using ballistic gelatin. It produced a 7-inch temporary stretch cavity, significant fragmentation, and penetrated 19.5 inches, demonstrating robust terminal performance despite the shorter barrel length.

Chapters

  1. 00:02Introduction: IMI 77gr OTM Test
  2. 01:18Gel Test Results: Neck, Cavity, Penetration
  3. 01:45Bullet Core and Jacket Fragments
  4. 02:25Other Side View of Gel Block
  5. 02:40Performance Analysis: Mk 262 Clone
  6. 03:0377gr MatchKing Characteristics
  7. 03:25Discussion on Penetration Depth
  8. 03:41Call to Action: Comments and Camera Rental

Frequently Asked Questions

How did IMI's 77gr OTM 5.56mm ammunition perform in a ballistic gel test from a 10.5-inch barrel?

IMI's 77gr OTM 5.56mm ammunition, a clone of the Mk 262, demonstrated significant performance in a 10.5-inch barrel. It created a substantial temporary stretch cavity of approximately 7 inches by 3 inches and exhibited considerable fragmentation, with a total penetration of 19.5 inches in 10% calibrated ballistic gelatin.

What are the key characteristics of the 77gr Sierra MatchKing bullet used in this test?

The 77gr Sierra MatchKing bullet is known for its tendency to cause significant fragmentation and create a large temporary stretch cavity. It is also generally regarded as an accurate projectile across a variety of rifle platforms, making it a popular choice for many shooters.

Does firing the IMI 77gr OTM from a shorter 10.5-inch barrel negatively impact its performance?

While the test aimed to see if the shorter 10.5-inch barrel had a detrimental effect, the IMI 77gr OTM still performed well, producing significant fragmentation and cavity. The primary observed difference might be in velocity, but the terminal ballistics remained impressive, though penetration was noted as deep.

What was the measured penetration depth of the IMI 77gr OTM 5.56mm in ballistic gelatin?

In the ballistic gelatin test, the IMI 77gr OTM 5.56mm ammunition achieved a total penetration depth of 19.5 inches. This depth was considered by the instructor to be on the deeper side, though they also noted that penetration is not always the most critical factor in terminal performance.

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