Hornady’s 338 ARC started out life as a military cartridge around 2017 when the US Department of Defense was looking for better subsonic accuracy and better terminal performance than what was available at the time. As opposed to the 300 Blackout that could provide both subsonic and supersonic performance accurately to 100 meters, the 338 ARC was designed to provide the same dual performance, but out to 300 meters. The military contract however did not play out and Hornady launched the 338 ARC for the civilian market.
