The Hornady Subsonic 7.62x39mm 255-grain Sub-X Flex Tip 20-round box is a purpose-built centerfire rifle cartridge engineered specifically for suppressed rifle platforms where maximum sound suppression and reliable expansion must coexist. A primary friction point in conventional subsonic rifle ammunition is the failure to expand at low impact speeds, causing heavy bullets to act like solid target rounds that over-penetrate without transferring adequate kinetic energy. Hornady completely resolves this low-velocity terminal limitation by loading its massive 255-grain Sub-X projectile with a patented Flex Tip insert, mechanically forcing broad, uniform terminal expansion even at subsonic impact speeds.
The core technical advantage relies on the interplay between low-velocity projectile mechanics and specialized propellant formulation. Traveling at nominal speeds around 1,050 FPS, traditional rifle bullets lack the hydraulic force required to expand upon impact. The elastomer Flex Tip acts as a compressible wedge, preventing the cavity from clogging with clothing or hide while actively driving inward to initiate broad expansion into the lead core. Combined with pre-engineered jacket grooves that control petal deformation and a high sectional density, this ultra-heavy 255-grain bullet carves wide, deep wound channels without fragmenting.
Driven below the speed of sound at 1,050 FPS, this heavy-grain cartridge eliminates the loud supersonic crack associated with standard rifle ammunition, maximizing sound suppression through baffled suppressors. Hornady utilizes specialized, clean-burning propellants tuned specifically to generate sufficient gas volume and pressure impulse to reliably cycle semi-automatic gas-operated platforms (such as AK-47 and SKS variants) without creating excessive blowback. Assembled in precision-drawn, reloadable virgin brass cases fitted with reliable non-corrosive primers, this load delivers ultra-quiet stealth and dependable terminal execution.
Key Benefits
- Patented Flex Tip (Sub-X) Technology: Elastic tip mechanically forces low-velocity expansion at subsonic speeds down to 1,050 FPS while resisting cavity clogging.
- Complete Supersonic Crack Elimination: Keeps muzzle velocity strictly subsonic (~1,050 FPS) to deliver maximum acoustic suppression through suppressors.
- Tuned Semi-Auto Gas Pressure: Propellant formulation provides sufficient gas impulse to cycle gas-operated 7.62x39mm rifles reliably.
- Heavy 255-Grain Mass & Pre-Grooved Jacket: Delivers high sectional density and controlled petal formation for deep penetration on medium game.
Technical Specification
- Ballistics: 7.62x39mm | 1,050 FPS Muzzle Velocity (Subsonic) | High Sectional Density Profile
- Projectile: 255 Grain | Sub-X (Subsonic Expansion) | Flex Tip Elastomer Insert | Pre-Grooved Cannelured Jacket | Lead Core
- Case/Primer: Precision-Drawn Virgin Reloadable Brass Case | Non-Corrosive Boxer Primed
- Logistics: 20 Rounds Per Box | Hornady Subsonic Series
- Dimensions: Standard 7.62x39mm Geometry | AK-47, SKS, & Bolt-Action Suppressed Configuration | SKU: 80787
- Application: Suppressed Target Shooting, Medium Game Hunting, Tactical Training, and Stealth Pursuit
- Standards: SAAMI Compliant | Hornady Factory Precision Benchmarks
SMKW sources ammunition that meets strict performance standards for reliability and terminal consistency, and this Hornady Subsonic 7.62x39mm load is engineered for users who require functional suppression without sacrificing ballistic effectiveness.
