First Shots with the new 338 ARC

Published on February 13, 2025
Duration: 19:46

This video provides initial impressions and performance data for the new 338 ARC cartridge, comparing it to the 300 Blackout and 8.6 Blackout. The CMMG Dissent rifle chambered in 338 ARC is tested for velocity with both subsonic and supersonic loads, demonstrating its potential for suppressed shooting and hunting applications. The presenter highlights the cartridge's design, which allows for similar overall length to 300 Blackout while utilizing a larger diameter bullet.

Quick Summary

The 338 ARC cartridge offers a unique blend of capabilities, fitting within standard magazine lengths while utilizing a larger .338 caliber bullet. It supports both subsonic and supersonic loads that operate at similar pressures, simplifying firearm function. Initial testing shows subsonic rounds around 1000 ft/s and supersonic rounds near 1940 ft/s with excellent consistency.

Chapters

  1. 00:10Introduction to 338 ARC
  2. 00:51338 ARC vs 300 Blackout vs 8.6 Blackout
  3. 02:46Shooting the CMMG Dissent 338 ARC
  4. 04:56Subsonic 338 ARC Velocity Testing
  5. 08:05Subsonic Testing with Powder Shift
  6. 09:38338 ARC Pressure & Gas System
  7. 10:33Supersonic 338 ARC Velocity Testing
  8. 12:25Extended Range Shooting with 338 ARC
  9. 14:08Bullet and Case Analysis
  10. 15:30338 ARC Bullet and Powder Charge
  11. 16:04Subsonic 338 ARC Bullet Comparison
  12. 17:27Rifle Comparison: 8.6 Blackout vs 338 ARC
  13. 18:43Future Testing and Comparisons

Frequently Asked Questions

What are the key advantages of the 338 ARC cartridge?

The 338 ARC offers the utility of operating at similar overall lengths to 300 Blackout, allowing for magazine compatibility, while using a larger diameter bullet. It also supports both subsonic and supersonic loads, with both operating at similar pressures, simplifying firearm function.

How does the 338 ARC perform with subsonic ammunition?

Subsonic 338 ARC loads (307 grain) achieved velocities around 1000 ft/s with relatively good consistency. Shifting the powder forward in the case did not significantly degrade velocity consistency, suggesting good powder burn characteristics.

What kind of velocities can be expected from supersonic 338 ARC loads?

Supersonic 338 ARC loads (175 grain) demonstrated excellent velocity consistency, averaging around 1940 ft/s with a very low standard deviation of 4.2 ft/s. This performance indicates strong potential for accuracy and hunting applications.

Can 9mm suppressors be used with the 338 ARC cartridge?

Yes, the 338 ARC can be suppressed by 9mm suppressors, provided the suppressor is rated for supersonic loadings and the manufacturer confirms compatibility. This offers a practical advantage for suppressed shooting.

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