Last reviewed: 2026-04-17 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The Fiocchi Range Dynamics 5.7x28mm subsonic ammunition loads a 62-grain full metal jacket boat tail projectile to velocities below 1,126 feet per second — the threshold where air displacement stops producing a supersonic crack. For shooters running suppressed FN Five-seveNs, Ruger-57s, or PS90 carbines, that translates to hearing-safe plinking and training without the sharp report of standard-velocity 5.7x28mm loads. The 5.7x28mm cartridge was developed by FN Herstal in the late 1980s for use in the P90 personal defense weapon and Five-seveN pistol, designed around a small-caliber, high-velocity projectile with low recoil and armor-penetrating capability when paired with SS190 military loads. Civilian iterations like this Range Dynamics offering prioritize reduced sound signature and recoil impulse for recreational shooting.
Load Profile
Fiocchi manufactures this load in Ozark, Missouri, under the Range Dynamics line — a value-tier product aimed at high-volume shooters who need consistent ignition and bullet stability without paying for match-grade components. The 62-grain FMJ boat tail design stabilizes across a wide range of barrel lengths, from the 4.8-inch barrel of a Five-seveN to the 16-inch barrel of a PS90. The boat tail base reduces drag in flight, improving trajectory predictability at 25 yards and beyond. Brass cases are boxer-primed and reloadable, though 5.7x28mm reloading remains a niche pursuit due to small primer pockets and limited bullet selection.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 5.7x28mm |
| Bullet weight | 62 grains |
| Bullet type | Full metal jacket boat tail (FMJ-BT) |
| Muzzle velocity | Subsonic (< 1,126 fps) |
| Rounds/box | 50 |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Intended use | Target shooting, suppressed shooting, plinking |
| Manufacturer | Fiocchi Ammunition |
Sold in 50-round boxes, this load fits training and plinking budgets without the premium attached to Hornady or Federal defensive loads. For more 5.7×28 ammo options across bullet weights and velocities, see our category catalog.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 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.
- Review the four rules of firearm safety before each range session
- Verify that your firearm is chambered for 5.7x28mm before loading — do not attempt to chamber in .22 Magnum or other similar-diameter cartridges
- Store ammunition separately from firearms in a locked container, away from humidity and temperature extremes
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