We’re diving deep with the ballistics team to explain the physics behind and technical specs of the 400-350 UpWall. From the self-annealing brass cases to the 72,000 PSI interference seal, this isn't just a new caliber—it’s a new category of internal ballistics. Listen in as we discuss the data following our testing; as this is preliminary and subject to SAAMI certification. - If you tried to swage a .400 bullet into a .350 case after listening to this... we hope you have a good warranty. Happy April Fool's from Barnes!