Hrndy 300blk 190gr Sub-x 20/200

Hornady 300 Blackout 190 Grain Sub-X subsonic ammunition delivers reliable expansion at transonic velocities, making it purpose-built for suppressed firearms and hearing-safe shooting applications. The 190-grain Sub-X bullet features a lead core with a gilded metal jacket and patented Flex Tip insert designed to expand consistently at the reduced velocity envelope typical of .300 Blackout subsonic loads—approximately 1,050 feet per second from standard rifle barrels.

The Sub-X's flat profile and longitudinal jacket grooves work in concert with the hollowpoint cavity to initiate controlled expansion without relying on velocity-dependent performance characteristics. This design philosophy addresses a critical challenge in subsonic ammunition development: achieving terminal effect when projectiles operate 300–400 feet per second below standard rifle velocity. The 300 Blackout cartridge was engineered for this exact scenario—maximum power and accuracy from subsonic loads when paired with a suppressor—and Hornady's Sub-X ammunition fully exploits that capability.

Operators and serious shooters running short-barreled rifles with sound suppressors benefit most from this load. Training environments, home-defense setups, and precision shooting disciplines where hearing protection is critical all leverage the hearing-safe ballistics and consistent accuracy of heavy subsonic ammunition. Each box contains 20 rounds, suitable for range work, qualification, or duty use depending on your department's or organization's ammunition protocols.

The .300 Blackout subsonic category represents a mature niche within modern rifle ammunition, and Hornady's engineering in this space is well-established. This load is compatible with any standard .300 Blackout chamber and functions reliably in both short-stroke and piston-driven operating systems common in AR-platform builds.