Last reviewed: 2026-04-17 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The 5.7x28mm frangible ammunition from Fiocchi Hyperformance delivers controlled energy transfer without the liability of over-penetration. Chambered in 5.7x28mm and loaded with a 35-grain copper-core, copper-jacketed projectile, this round fragments upon impact with hard barriers — steel, drywall, bone — minimizing pass-through risk in close-quarters defensive scenarios and indoor range environments. The polymer tip guarantees reliable feeding in FN Five-seveN pistols, PS90 carbines, and Ruger-57 platforms.
Load Profile
Fiocchi engineers this load around a fully copper-jacketed, polymer-tipped bullet that splits into fragments upon contact with hard surfaces, dissipating energy rapidly rather than maintaining structural integrity through intermediate barriers. Fiocchi manufactures this cartridge at their Lake City facility under ISO-certified quality protocols, ensuring lot-to-lot consistency in primer ignition and powder charge. The lead-free construction meets indoor range mandates and California Prop 65 compliance standards.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 5.7x28mm |
| Bullet weight | 35 grains |
| Bullet type | Frangible, polymer tip |
| Rounds/box | 50 |
| Case | Brass |
| Intended use | Defense, indoor range, hunting (varmint) |
| Manufacturer | Fiocchi |
This load ships in 50-round boxes and runs reliably across 5.7x28mm platforms from FN, Ruger, and CMMG. 5.7×28 ammo in frangible configurations is purpose-built for steel target training, confined-space defensive scenarios, and varmint control where barrier penetration is a legal or safety concern.
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.
- Treat every firearm as if it is loaded — muzzle in a safe direction at all times
- Verify current state and local ammunition purchasing requirements before ordering
- Store in factory packaging in a climate-controlled environment; frangible projectiles are impact-sensitive and should not be subjected to physical shock during handling
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