Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For range shooters running 5.56x45mm NATO 55 grain loads by the case, Fiocchi Range Dynamics delivers M193-equivalent ballistics at a volume price. This Full Metal Jacket load launches a 55-grain projectile at 3240 feet per second from a 20-inch test barrel, generating 1282 foot-pounds of muzzle energy. Boxer-primed brass cases allow reloading, and non-corrosive primers keep your chamber clean after extended strings. Fiocchi loads this ammunition at their Ozark, Missouri facility to SAAMI specifications, and the Range Dynamics line is engineered to give you similar point-of-impact performance as their Exacta match loads — letting you train with cheaper ball ammo and switch to match rounds for precision work without re-zeroing.
Built for the Box
Fiocchi manufactures the Range Dynamics line for shooters who measure ammunition consumption in cases, not boxes. The 55-grain FMJ projectile uses a 0.243 G1 ballistic coefficient, providing predictable trajectory out to 300 yards in most AR-15 platforms. The brass case construction handles repeated firings in semi-automatic rifles, and the boxer primer allows you to reload spent cases when components are available. Fiocchi loads this ammunition to 5.56 NATO pressure specifications — it functions in both 5.56 chambers and .223 Remington chambers, though the higher pressure makes it better suited for rifles stamped 5.56 NATO or 5.56/.223 Wylde.
Specs at a Glance
| Spec | Value |
|---|---|
| Caliber | 5.56x45mm NATO |
| Bullet weight | 55 grains |
| Bullet type | Full Metal Jacket |
| Muzzle velocity | 3240 fps (20-inch barrel) |
| Muzzle energy | 1282 ft-lbs |
| G1 ballistic coefficient | 0.243 |
| Rounds/box | 1000 (case) |
| Case | Brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Intended use | Range & Target |
| Manufacturer | Fiocchi |
| Country of origin | United States of America |
This load is designed for AR-15 and M16-pattern rifles chambered in 5.56 NATO. Fiocchi loads to SAAMI specifications, and the supersonic velocity rating means the projectile stays above the speed of sound past 500 yards in standard atmospheric conditions. The 1000-round case format reduces per-round cost and gives you enough ammunition for multiple range sessions without reordering. You’ll find this load in the M193 Ammo category alongside other 55-grain FMJ loads built for volume shooting.
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.
- Follow the four rules of firearm safety at all times when handling firearms and ammunition.
- Verify your state and local laws permit possession of 5.56 NATO ammunition — some jurisdictions restrict rifle-caliber ammunition or set magazine capacity limits that affect how you load this ammunition.
- This ammunition contains lead. Wash hands after handling, and follow California Proposition 65 warnings if applicable in your jurisdiction.
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