338 ARC: Supersonic vs Subsonic Test at 100 Yards

Published on December 29, 2025
Duration: 4:34

This expert-level guide details a ballistic test comparing .338 ARC supersonic and subsonic ammunition at 100 yards. Ryan Gresham of Gun Talk Media showcases the performance differences using a lightweight Faxon Ion-X Ultralight rifle with a Huxwrx suppressor. The test highlights significant point of impact shifts and discusses the energy retention of heavy subsonic projectiles, offering valuable insights for shooters considering this cartridge for hunting applications.

Quick Summary

The .338 ARC cartridge is designed as a heavier alternative to .300 Blackout for enhanced AR-15 hunting performance. A test at 100 yards showed Hornady's 307-grain subsonic .338 ARC rounds dropped 11.5-12 inches more than 175-grain supersonic rounds, highlighting significant point of impact shifts and the heavy subsonic bullet's 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 (Advanced Rifle Cartridge) from Hornady is developed as a heavier alternative to .300 Blackout and a competitor to 8.6 Blackout. It's engineered for superior hunting performance within the AR-15 platform, offering increased downrange energy and bullet weight options.

How much does .338 ARC subsonic ammunition drop at 100 yards compared to supersonic?

In a test at 100 yards using a 12.5-inch barreled rifle, the Hornady 307-grain .338 ARC subsonic rounds dropped approximately 11.5 to 12 inches more than the 175-grain supersonic rounds, which grouped at the point of aim.

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

The test utilized a lightweight Faxon Ion-X Ultralight rifle with a 12.5-inch barrel. It was equipped with a Huxwrx 36 Ti suppressor and a Vortex 1-6x optic, a setup optimized for maneuverability and short-to-medium range shooting.

What are the key differences between .338 ARC supersonic and subsonic loads?

The primary differences lie in bullet weight and velocity. The tested supersonic load was a 175-grain hollow point around 2000 fps, while the subsonic load was a heavier 307-grain Sub-X bullet at 1050 fps. This results in a significant physical size difference and distinct ballistic performance.

Related News

All News →

More Tactical & Gear Videos You Might Like

More from Gun Talk Media

View all →