Level III vs Level IIIA Body Armor | The biggest ...
Level/Type IIIA Body Armor. According to the National Institute of Justice (NIJ), Level/Type IIIA body armor is designed to defeat a .357 Sig FMJ Flat Nose (FN) weighing less than 8.1 grams or 125 grain.. The muzzle velocity must be under 1,470 ft/per second at this weight for a Level IIIA to stop the bullet.. Level IIIA will also defeat a .44 Magnum Semi Jacketed Hollow Point (SJHP) if it ...