- Component bullet for handloading — not loaded ammunition; no FAC required to purchase
- 35 cal .357 diameter, 250 grain, SUB-X (Subsonic eXpanding) design
- Expands reliably at subsonic velocities — Flex Tip initiates expansion from 900 fps
- Meets FBI protocol terminal ballistic test requirements for penetration and expansion
- Cannelured jacket provides positive case crimp for reliable semi-auto cycling
- Long jacket grooves plus flat-nose profile aid consistent subsonic expansion
- Ideal for suppressed .357 calibre handloads where staying sub-sonic is essential
The Hornady SUB-X (Subsonic — eXpanding) .357 diameter 250-grain bullet is a component projectile for handloaders developing subsonic loads, particularly for suppressed firearms. It is not loaded ammunition — this is a bare bullet head sold for reloading. Engineered to deliver reliable expansion below the speed of sound, the SUB-X features a lead core and long grooves in its gilding-metal jacket that work alongside the flat nose profile and Hornady's patented Flex Tip insert to initiate consistent expansion at velocities as low as 900 fps. A cannelured jacket provides a positive case crimp, making the bullet well-suited for use in semi-automatic pistols and carbines where reliable feeding and cycling are essential. Terminal performance meets FBI protocol ballistic test requirements — an important benchmark for deep penetration and reliable expansion across barrier types. The heavier 250-grain projectile maximises momentum at subsonic velocities, making this a practical choice for precision suppressed handloading in .357 calibre platforms.
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