Fiocchi—the manufacturer of all the industry’s 5.7x28 mm FN ammunition—is now providing the cartridge ... while Combo SUB instead pairs 300 FMJs with 100 62-grain Range Dynamics Subsonic ...

While the 5.7x28mm cartridge has seen a resurgence in 2020, ... The 5.7x28 mm: History & Design. ... Ammunition is problematic with FN and Fiocchi options about all that is available in the U.S. now.