Multiple in game tests at different ranges indicate different behavior. 0-12m - 500dmg 12-66m - decreasing linearly to ~364dmg per shot >66m - constant at ~364dmg 150% headshot multiplier like shotgun pellets. This gives you 2 shot kill anywhere on the body at 0-12m. 3 body, 2 headshot for Nanoweave 5 non heavy or NMG heavy 0-12m. 4 body, 3 headshot for nanoweave 5 NMG heavy 0-12m. At the worst it gets to 3/2 for nano 0-3, up to 5/3 for NMG + any nanoweave. Although I heard that they implemented a breaking point for the NMG shield, but I do not know how that works so this is speculative until then.