Are 5.56 MATCH Bullets More ACCURATE Than FMJ From An AR-15?

Published on July 10, 2022
Duration: 9:51

This guide details a 100-yard accuracy test for various 5.56mm ammunition types fired from a Ruger MPR rifle. The test, conducted by an experienced shooter, systematically evaluates FMJ and match-grade rounds to determine their comparative performance. Key takeaways include the surprising accuracy of M855 and potential instability issues with heavier match bullets in certain twist rates.

Quick Summary

The Winchester M855 62gr Green Tip FMJ ammunition was the most accurate in this AR-15 test, achieving a sub-MOA group of 0.80 inches at 100 yards. This outperformed match-grade options, highlighting that standard FMJ can sometimes be more accurate depending on the rifle's specific characteristics and barrel twist rate.

Chapters

  1. 00:00Introduction and Test Purpose
  2. 00:13Rifle Setup
  3. 00:34Ammunition Selection
  4. 01:35Target Setup at 100 Yards
  5. 02:17Shooting M193 55gr FMJ
  6. 02:59Shooting M855 62gr Green Tip
  7. 03:35Shooting Frontier 68gr Match
  8. 04:14Shooting Frontier 75gr Match
  9. 04:44Initial Target Inspection
  10. 05:09M193 Group Measurement
  11. 05:27M855 Group Measurement
  12. 05:54Frontier 68gr Group Measurement
  13. 06:17Frontier 75gr Group Measurement and Stability
  14. 07:06Test Conclusion and Surprising Results
  15. 07:28Discussion on Variables and Overall Satisfaction
  16. 08:07Ammunition Weight Pattern
  17. 08:29Engagement and Future Tests

Frequently Asked Questions

Which 5.56mm ammunition was most accurate in the AR-15 test?

In this specific test conducted from a Ruger MPR with an 18-inch barrel and 1:8 twist, the Winchester M855 62gr Green Tip FMJ ammunition proved to be the most accurate, achieving a sub-MOA group of 0.80 inches at 100 yards.

Can 5.56mm match bullets be less accurate than FMJ rounds?

Yes, match bullets can sometimes be less accurate than FMJ rounds depending on the specific rifle, barrel twist rate, and ammunition lot. In this test, the Winchester M855 FMJ outperformed some match-grade options, and the heavier Frontier 75gr BTHP Match showed signs of instability.

What factors affect 5.56mm bullet stability in an AR-15?

Bullet stability is significantly affected by the rifle's barrel twist rate. A 1:8 twist rate, as used in the Ruger MPR, is generally good for stabilizing bullets up to around 70-77 grains, but heavier bullets may exceed its optimal stabilization capability, leading to keyholing or larger groups.

How was the accuracy test conducted?

The test involved firing four rounds of each ammunition type (Winchester M193, M855, Frontier 68gr BTHP Match, Frontier 75gr BTHP Match) at 100 yards from a Ruger MPR rifle using a Caldwell Lead Sled. Group sizes were measured with digital calipers, and bullet hole integrity was observed.

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