Is .338 ARC The 8.6 Blackout KILLER?
The .338 ARC is a new caliber designed for the AR-15 platform, aiming to bridge the gap between 300 Blackout and 8.6 Blackout. While technically compatible with AR-15 lowers and 6.5 Grendel/6 ARC bolts, it faces significant challenges with magazine reliability. Ballistic gel tests show 8.6 Blackout offers superior lethality due to its twist rate, and 300 Blackout is more practical, leaving the .338 ARC in a difficult position despite its potential.









