Phantom Defense has launched two new subsonic 300 Blackout rounds designed for 1:5 twist barrels. The 238 grain fracturing round and the 242 grain Big Brother Expander offer enhanced performance with reliable penetration and expanded wound cavities. Heavier projectiles improve trajectory stability and terminal consistency, optimizing subsonic applications. Availability starts this week.
Phantom Defense states “We are excited to announce two new subsonic 300 Blackout rounds, both purpose-built for 1:5 twist barrels. First lots of both of these rounds will be available this week.
The first is a 238 grain proprietary fracturing subsonic design, adapted from our 405 grain 8.6 Blackout Revenant design. On impact, the bullet sheds three petals that radiate outward while the base continues on a linear path. In recent field testing we saw these rounds perform exceptionally, producing wound cavities unlike what is typically associated with subsonic 300 BLK.
The second round we are launching is a new 242 grain Big Brother Expander, a Phantom-exclusive Maker Rex projectile that replaces the legacy 220 grain version. The expander delivers massive cutting diameters, reliable penetration, and devastating pass-throughs, making it the heavy subsonic counterpart to our versatile 200 grain Slow Papi.
Heavier subsonic projectiles in 300 Blackout present measurable advantages over lighter designs. Their higher ballistic coefficients reduce drag, yielding flatter trajectories and greater resistance to wind drift. Increased sectional density promotes deeper and more stable penetration, particularly through bone or intermediate barriers. At the same velocity, additional mass generates more momentum, improving the reliability of expansion or fracturing in solid copper designs. When paired with 1:5 twist barrels, heavier bullets also experience higher rotational stress, which enhances petal shedding, yaw behavior, and overall terminal consistency. Collectively, these factors make heavy subsonics more stable, more reliable across varying distances and conditions, and better suited to the physics of suppressed, subsonic applications. All of this plus the accuracy you have come to expect from Phantom subsonic products.”
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