U.S. military supply or 5.56mm M193 BT 3250 ft/s rounds meeting NATO 56 +0/-2 grains (990 m/s) specifications U.S. military supply or 5.56mm M855 BT 3115 ft/s rounds meeting NATO 61.8 ± 1.5 grains (950 m/s) specifications NIJ RF3 30.06 M2 AP FMJ U.S. military supply or 2880 ft/s (Formerly NIJ Spire PT AP rounds meeting NATO 0101.06 Level (878 m/s) specifications 165.7 +0/-7 grains IV)
5.56mm M193 BT 56 +0/-2 grains U.S. military supply or rounds meeting NATO specifications 3250 ft/s (990 m/s) 5.56mm M855 BT 61.8 ± 1.5 grains U.S. military supply or rounds meeting NATO specifications 3115 ft/s (950 m/s) NIJ RF3 (Formerly NIJ 0101.06 Level IV) 30.06 M2 AP FMJ Spire PT AP 165.7 +0/-7 grains U.S. military supply or rounds meeting NATO specifications 2880 ft/s (878 m/s)
nij-specification-of-threat-levels-and-ammunition-draft-for-public-comment.docx