User blog comment:Vanguard13/Pick Your Poison (Ammo, that is)/@comment-5038903-20120812185106/@comment-24174486-20120812224815

Along with being effective against organic/synthetic health, armour, and barriers, Warp Ammo also significantly increases damage against enemies affected by biotics. In ME2, Warp Ammo doubles damage against enemies affected by biotics; in ME3, lifted enemies take between 50%-125% extra damage based on rank and evolutions.