338 ARC: Supersonic vs Subsonic Test at 100 Yards

Published on December 29, 2025
Duration: 4:34

This video from Gun Talk Media features Ryan Gresham testing the new .338 ARC cartridge. He compares Hornady's supersonic and subsonic loads at 100 yards using a Faxon Ion-X Ultralight rifle equipped with a Huxwrx suppressor. The test highlights the significant difference in point of impact between the two ammunition types, with the subsonic rounds dropping considerably more, demonstrating their distinct ballistic properties and potential applications.

Quick Summary

Ryan Gresham of Gun Talk Media tested Hornady's .338 ARC supersonic (175gr @ ~2000 fps) and subsonic (307gr Sub-X @ 1050 fps) ammunition at 100 yards. Using a Faxon Ion-X Ultralight rifle with a Huxwrx suppressor, the test revealed a substantial point of impact difference, with subsonic rounds dropping 11.5-12 inches more, highlighting their distinct ballistic performance and energy retention.

Chapters

  1. 00:00Introduction to .338 ARC
  2. 00:45Rifle and Gear Setup
  3. 01:21Ammunition Specifications
  4. 02:50Range Testing at 100 Yards
  5. 03:20Ballistic Results and Analysis

Frequently Asked Questions

What is the .338 ARC cartridge designed for?

The .338 ARC cartridge is designed by Hornady for the AR-15 platform, intended as a heavier-hitting option than .300 Blackout and a competitor to 8.6 Blackout, particularly for hunting applications.

What is the difference in point of impact between supersonic and subsonic .338 ARC rounds at 100 yards?

During testing at 100 yards, the 307-grain .338 ARC subsonic rounds dropped approximately 11.5 to 12 inches more than the 175-grain supersonic rounds, demonstrating a significant difference in trajectory.

What rifle and suppressor were used in the .338 ARC test?

The test utilized a Faxon Ion-X Ultralight rifle with a 12.5-inch barrel, equipped with a Huxwrx 36 Ti suppressor and a Vortex 1-6x optic.

What are the key ballistic differences between Hornady's .338 ARC supersonic and subsonic loads?

The supersonic load (175gr) travels around 2000 fps, while the subsonic load (307gr Sub-X) travels at 1050 fps. The subsonic round is much heavier and exhibits a significantly greater drop at 100 yards, though it retains high energy.

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