Groups & Velocities from 6 AR-15 Barrels: AAC 77gr OTM Review

Published on May 8, 2025
Duration: 13:28

Preston Moore, an expert firearms instructor, provides a detailed review of AAC 77gr OTM ammunition, testing its performance across six different AR-15 barrels. The analysis includes group sizes, velocities, and reliability, utilizing professional-grade equipment and methodology. This comprehensive evaluation aims to address user concerns regarding quality and velocity consistency, offering valuable data for shooters.

Quick Summary

Expert firearms instructor Preston Moore conducted a comprehensive test of AAC 77gr OTM ammunition across six AR-15 barrels. The data revealed velocities ranging from 2409 to 2553 FPS, with the Noveske Rival V2 17" barrel achieving the best accuracy at 2.4 MOA. No malfunctions were observed during testing.

Chapters

  1. 00:00Introduction & Overview
  2. 00:24Price and Quality Concerns
  3. 00:51Ammunition Specifications
  4. 01:41Barrel Testing Selection
  5. 02:12Test Methodology and Setup
  6. 02:46Data Collection Tools
  7. 04:02Visual Inspection and Reliability
  8. 04:25Velocity Summary Across Barrels
  9. 04:56A-ZED Metric Explained
  10. 05:13Daniel Defense 16" Performance
  11. 05:56Geissele 16.25" Performance Issues
  12. 08:11SOLGW SPR 16" Results
  13. 08:58Hodge Defense 14.5" Results
  14. 09:42Noveske Rival V2 17" Success
  15. 10:24Nordic Components 18" Performance
  16. 11:03Overall Testing Conclusions

Frequently Asked Questions

What are the key specifications of the AAC 77gr OTM ammunition?

The AAC 77gr OTM features a Hornady 77gr Open Tip Match projectile, AAC Boxer-Primed reloadable brass, a G1 ballistic coefficient of 0.362, and is rated at 2700 FPS from a 20-inch barrel. It has an AAC headstamp and non-crimped primers.

How did the AAC 77gr OTM perform across different AR-15 barrels in terms of velocity?

Average velocities for the AAC 77gr OTM ranged from 2409 FPS from a 14.5" Hodge Defense barrel to 2553 FPS from an 18" Nordic Components barrel. Standard deviations averaged 21 FPS across the tested firearms.

Which AR-15 barrel provided the best accuracy with AAC 77gr OTM ammunition?

The Noveske Rival V2 17" barrel yielded the best results, achieving a 2.4 MOA 30-shot group and an A-ZED score of 225 yards when tested with AAC 77gr OTM ammunition.

Are there any reported quality or reliability issues with AAC 77gr OTM ammunition?

While some online reports suggest potential quality and velocity issues with newer batches of AAC 77gr OTM, this specific test observed no malfunctions during 30-shot strings, and fired brass showed no significant pressure signs.

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