根据https://www.ojp.gov/pdffiles1/nij/223054.pdf
Type IIIA armor that is new and unworn shall be tested with .357 SIG FMJ Flat Nose(FN) bullets with a specified mass of 8.1 g (125 gr) and a velocity of 448 m/s ± 9.1 m/s (1470ft/s ± 30 ft/s) and with .44 Magnum Semi Jacketed Hollow Point (SJHP) bullets with a specifiedmass of 15.6 g (240 gr) and a velocity of 436 m/s ± 9.1 m/s (1430 ft/s ± 30 ft/s).