b' SubsonicHornady has made a revolutionary breakthroughwithout breaking the sound barrier. Hornady Subsonic Ammunition for 300 Blackout represents the first truly and reliably expanding subsonic round. Other subsonic rounds may expand, but petals shear off, causing the bullet to veer off course.Heres how Hornady engineers solved that problem. The hollow-point cavity of the Sub-X (SubsoniceXpanding) bullet features the patented Flex Tip insert, which helps the bullet expand at low velocities.That results in deep penetration and large wound channels with no loss of accuracy, proving that you dont have to be fast and loud to make a big impact.SUB-X BULLET TECHNOLOGYIn addition to its patented Flex Tip, long grooves in the gilding metal jacket of the 190 grain (12,3g) Sub-X combine with the bullets flat profile to ensure expansion. The Sub-X features a lead core and a cannelure for a positive case crimp for use in semi-automatics.PROVEN PERFORMANCEPerformance of 300 Blackout Subsonic meets or exceeds FBI ProtocolShhh terminal ballistic test requirements. Impact velocity of 311 m/sec into ballistic gelatin provides 41-46 cm penetration and 90%+ weight retention.HEARING SAFE tell everyone!Hornady Subsonic Ammunition doesnt have the loud report of a supersonic round, and paired with a suppressor, its even quieter. Unique powders optimized for subsonic use result in a low flash signature, ideal for suppressed performance.30-30 WIN 175 GR. SUB-X 16 Ammunition hornady.com'