Updated Jan 29. 2026: 8.6 Blackout was standardized as a SAAMI cartridge. We have added a section discussing the SAAMI Standardization as well as updated the cartridge and chamber drawing to reflect the new standard. This write up began life as a comparison between 338 Spectre, 338 ARC and 8.6 Blackout. However, as I began … Continue reading An Honest Look at 8.6 Blackout