338 ARC & the CMMG Dissent -- Is It Better Than 8.6 Blackout?

Published on May 25, 2025
Duration: 32:05

This video provides an in-depth review and ballistic testing of the new Hornady 338 ARC cartridge, primarily using the CMMG Dissent firearm. The presenter, Mark, details the cartridge's performance, comparing it to 8.6 Blackout and 300 Blackout, and discusses its potential applications, including hunting and home defense. Key aspects covered include velocity, penetration in ballistic gel, suppressor compatibility, and ammunition cost/availability.

Quick Summary

The Hornady 338 ARC is a new rifle cartridge designed for increased kinetic energy and suppression. Tested in the CMMG Dissent, it showed 100% reliability and impressive ballistic performance, penetrating 16 inches of gel with supersonic loads and expanding well with subsonic rounds.

Frequently Asked Questions

What is the Hornady 338 ARC cartridge?

The Hornady 338 ARC is a new rifle cartridge released this year, designed to offer increased kinetic energy and better suppression capabilities compared to cartridges like 300 Blackout, while potentially challenging the popularity of 8.6 Blackout.

How does the CMMG Dissent perform with 338 ARC ammunition?

The CMMG Dissent firearm demonstrated 100% reliability when chambered in 338 ARC during testing, which the presenter found to be a positive and somewhat surprising outcome based on other reports.

What are the ballistic performance characteristics of the 338 ARC?

The 338 ARC 175gr supersonic round achieved around 1,970 fps from a 10.5-inch barrel and penetrated 16 inches of ballistic gel. The 307gr subsonic round averaged about 1,200 fps and showed good expansion in gel.

What are the main drawbacks of the 338 ARC cartridge?

The primary downsides of the 338 ARC are its high ammunition cost (around $1.75-$2.00 per round), limited availability requiring special orders, and potential magazine compatibility issues with firearms chambered in this caliber.

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