Hornady Sub‑X (Subsonic eXpanding) bullets are engineered to expand reliably at subsonic velocities while retaining deep penetration characteristics. The design pairs a lead core with a gilding metal jacket and a polymer Flex Tip in the hollow point cavity to promote controlled expansion at low speeds. Long jacket grooves and cannelures allow positive case crimp, making these projectiles suitable for semi-automatic platforms and subsonic load development.
Key Specifications
- The caliber/diameter is .308 (30 Cal).
- The bullet weight is 175 grains.
- The bullet style is a hollow point (Sub‑X subsonic).
- The tip material is a polymer Flex Tip.
- The core material is lead.
- The jacket material is gilding metal (brass).
- The ballistic coefficient (G1) is 0.300.
- The sectional density is .264.
- There are 100 bullets per box.
- The bullets feature a cannelure for positive case crimp.
For shooters assembling subsonic loads or seeking controlled expansion at lower velocities, Hornady Sub‑X 175 gr .308 bullets offer a purpose-built option. Their combination of Flex Tip, jacket design, and cannelure make them well suited to suppressed or semiautomatic applications where consistent terminal performance and reliable seating are priorities.
