SKU: A00478
UPC: 858767004782
MPN: 00478
The Atomic 300 AAC Subsonic 260gr RNSP ammunition represents purpose-built ammunition engineered for suppressed rifle systems where noise reduction and reliability are non-negotiable. Developed for operators and precision shooters who depend on subsonic performance, this cartridge delivers consistent downrange energy while staying below the sound barrier—critical for tactical operations, training, and hunting applications where signature control matters. Each box contains 20 rounds, with 10 boxes per case, providing serious shooters with the quantity needed for extended range sessions or field deployment.
Built with a 260-grain round nose soft point (RNSP) projectile, this subsonic load maintains subsonic velocity in .300 AAC Blackout platforms while preserving bullet integrity and terminal performance. The heavier 260-grain projectile resists velocity degradation at subsonic speeds and provides superior penetration and expansion on target compared to lighter subsonic offerings. Atomic Ammunition's quality control ensures consistent loading, uniform powder charges, and reliable primer ignition—factors that directly impact shot-to-shot consistency in suppressed systems where marginal velocity variations become audible inconsistencies.
Law enforcement tactical teams, military designated marksmen, and civilian suppressors users benefit most from subsonic ammunition engineered to this standard. The Atomic 300 AAC Subsonic pairs seamlessly with suppressed .300 Blackout rifles, AR-pattern short-barreled rifles (SBRs), and bolt-action platforms optimized for subsonic cartridges. Reliable function across various suppressor designs and barrel lengths makes this load ideal for both indoor ranges and field operations where noise signature reduction provides a tactical advantage. Compatibility with standard .300 Blackout magazines and chambers is universal.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.