A preferred projectile includes a toughened polymer resin comprising an elastomer-modified epoxy functional adduct formed by the reaction of a bisphenol A liquid epoxy resin and a carboxyl terminated butadiene-acrylonitrile elastomer; and a curative agent by which the toughened polymer resin is cured; wherein the cured toughened polymer resin is in the shape of a bullet. The projectile preferably has an average density less than the density of lead. A preferred ammunition cartridge includes a propellant and the aforesaid projectile fixed in position relative to the propellant; and an ammunition cartridge includes a primer; a propellant; and the aforesaid projectile; as well as a casing containing the primer, propellant and projectile, with the projectile projecting from the casing.