338 ARC Build Range Report
Introduction to the 338 ARC AR-15 Build
In this video, Caleb and Steve from Brownells introduce their custom AR-15 chambered in 338 ARC. Built from the ground up, this rifle is designed to handle both supersonic and subsonic Hornady ammunition. The team shares background on the build and sets the stage for a day of range testing at Big Springs in Iowa.
Zeroing and Gas Block Adjustment
Before diving into accuracy testing, the rifle is zeroed in. Caleb walks through the process of tuning the Rifle Speed adjustable gas block. With no tools required, he demonstrates how to set the gas block to ensure proper cycling, especially as the rifle gets dirtier over time.
Accuracy at 25 and 100 Yards
After zeroing, the Brownells team begins testing the rifle’s precision at 25 and 100 yards. The Trijicon Credo optic offers clear visuals, and the rifle groups shots tightly. Caleb and Steve confirm excellent windage and elevation adjustments with just a few rounds.
Supersonic vs Subsonic Ammo Test
To compare ballistic performance, Caleb fires both Hornady 175-grain supersonic and 307-grain subsonic rounds. The point-of-impact difference is surprisingly small. However, the subsonic rounds struggle with cycling, prompting further gas block tuning.
Tuning for Subsonic Cycling
With the subsonic rounds producing lower pressure, Caleb opens the gas block further to achieve reliable bolt lock-back. He emphasizes the importance of customizing the gas system based on the ammo type to ensure consistent performance.
Subsonic Accuracy at 100 Yards
Once the gas system is properly tuned, the subsonic rounds begin grouping just as well as the supers. The accuracy remains impressive, and the rifle performs reliably without excessive recoil. The 338 ARC shows it can handle both ammo types with minimal adjustment.
Extended Range Accuracy with Subsonic
Caleb stretches the subsonic shots out to 200 yards and beyond. By adjusting holdovers and using the MRAD reticle, he demonstrates that the heavy 307-grain bullets can still reach distance targets with great precision. The feedback from steel targets confirms solid hits.
Supersonic Impact at Distance
Switching back to supersonic rounds, the rifle continues to perform flawlessly. With faster velocities and flatter trajectories, the supers make short work of distant targets. The comparison between the two ammo types highlights the versatility of the 338 ARC platform.
Steve Takes a Turn Firing
Steve jumps behind the rifle and quickly starts ringing steel. Despite switching sides, he adapts quickly and praises the rifle’s light recoil and excellent trigger feel. Even at extended distances, the AR-15 in 338 ARC delivers consistent results.
Final Thoughts on 338 ARC Performance
Caleb and Steve reflect on the 338 ARC’s strengths. It combines the soft shooting feel of smaller calibers with hard-hitting performance. Whether you're targeting hogs, coyotes, or just enjoying range time, the 338 ARC proves to be an accurate and fun cartridge.
Outro and How to Get Help
To wrap things up, the team invites viewers to ask questions or share experiences with the 338 ARC. For anyone needing help with builds, optics, ammo, or tuning, the Brownells tech line is available. The video ends with a reminder to like and subscribe for more in-depth firearm content.
Watch the 338 ARC Rifle Build
