Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Hornady Subsonic 40 S&W ammo pairs 180-grain XTP jacketed hollow points with powder charges tuned to stay subsonic — 950 fps from a 4-inch barrel. Six controlled-expansion serrations divide each XTP bullet into symmetrical sections that open reliably at lower velocities while delivering the deep penetration self-defense scenarios demand. Brass cases and boxer primers support reloading cycles, and the low flash signature works in suppressed or unsuppressed pistols without compromising terminal performance.
Built for the Box
Each XTP bullet uses a swaged core and drawn copper jacket — uniform construction that stabilizes in flight and expands predictably on impact. Hornady engineers the jacket thickness and serration depth to balance penetration depth with wound channel diameter, meeting FBI Protocol requirements across common defensive barriers. The cannelured bullet secures in the case mouth for reliable feeding in semi-automatic platforms, and the subsonic velocity eliminates the supersonic crack that can fatigue shooters during high-volume training.
Specs at a Glance
| Spec | Value |
|---|---|
| Caliber | 40 S&W |
| Bullet weight | 180 grains |
| Bullet type | Hornady XTP Jacketed Hollow Point |
| Muzzle velocity | 950 fps |
| Muzzle energy | 361 ft-lbs |
| Test barrel length | 4 inches |
| Rounds per box | 20 |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Intended use | Self Defense |
| Manufacturer | Hornady |
The low flash powder charge reduces muzzle signature when you fire in low light, and the reloadable brass cases extend your training budget when paired with standard large pistol primers. Browse the full 40 cal ammo selection for additional defensive and range loads.
Safe Handling & Compliance
Federal law requires purchasers to be at least 21 years old for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities — review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Follow the four universal rules of firearm safety on every range session
- Verify current state and local ammunition laws in your jurisdiction before ordering
- This product contains lead — store and handle in accordance with California Proposition 65 warnings
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