SIG SAUER MCX-SPEAR .308 13" Accuracy Test (Sub-MOA Group?!)

Published on April 9, 2024
Duration: 22:20

This video details an accuracy test of the SIG SAUER MCX-SPEAR chambered in .308 Winchester/7.62 NATO with a 13-inch barrel, specifically evaluating its performance with various ammunition types while suppressed. The test aims to determine if the shorter barrel can still achieve DMR-level accuracy. The results highlight a significant preference for specific bullet weights and types, with Sellier & Bellot 168-grain ammunition achieving sub-MOA accuracy.

Quick Summary

The SIG MCX-SPEAR .308 with a 13-inch barrel can achieve sub-MOA accuracy, with Sellier & Bellot 168-grain hollow point boat tail ammunition producing a 0.75-inch group at 100 yards. This indicates a preference for mid-weight projectiles, while heavier 175-grain loads performed poorly. Affordable 7.62 NATO 150-grain ball ammo also showed decent performance for general use.

Chapters

  1. 00:00Introduction & Test Goals
  2. 00:59Ammunition Selection & Control Group
  3. 03:00IMI 7.62 NATO 150gr FMJ Test
  4. 05:01Federal Gold Medal Match 175gr Test
  5. 07:07Sellier & Bellot 168gr Precision Rifle Test
  6. 09:27Foke 175gr Match King Test
  7. 11:54Federal Fusion 165gr Soft Point Test
  8. 14:21Accuracy Results Summary
  9. 20:15Key Takeaways & Ammunition Recommendations
  10. 21:17Testing Distance Confirmation (100 Yards)

Frequently Asked Questions

What is the best ammunition for the SIG MCX-SPEAR .308 with a 13-inch barrel?

Based on the accuracy test, Sellier & Bellot 168-grain hollow point boat tail ammunition achieved the best results, producing a sub-MOA group of 0.75 inches at 100 yards. This suggests the platform prefers mid-weight projectiles for optimal precision.

Can a 13-inch barrel on a .308 SIG MCX-SPEAR achieve sub-MOA accuracy?

Yes, the SIG MCX-SPEAR with a 13-inch barrel demonstrated the capability to achieve sub-MOA accuracy, specifically a 0.75-inch group, when using the right ammunition like Sellier & Bellot 168-grain HPBT. This indicates that shorter barrels can still be highly precise with proper load selection.

How does 7.62 NATO ball ammunition perform in the SIG MCX-SPEAR .308?

IMI Systems 7.62 NATO 150-grain Full Metal Jacket ball ammunition performed adequately, yielding a 2.25-inch group. Notably, four out of five shots grouped within 1 inch, making it a viable and affordable option for general use, training, and backup stock.

Does the SIG MCX-SPEAR .308 prefer heavier or lighter .308 projectiles?

The accuracy test indicated a preference for lighter to mid-weight projectiles. Heavier 175-grain ammunition from Federal and Foke performed poorly, while 168-grain Sellier & Bellot achieved sub-MOA accuracy. This suggests the 13-inch barrel is better suited for stabilizing and accurately launching projectiles in the 165-168 grain range.

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