Here's all the info I have from the article (it's in the freebie "On Target" magazine.)
"Double Tap 80-Grain .223 Rem. Ammunition
Mike McNett, the main man at Double Tap ammunition, is a real innovator who's goal in life is to wring maximum performance out of every cartridge his company loads. Case in point: Double Tap's new .223 Rem. 80-grain hollowpoint boattail load. The vast majority of ARs out there are rifled in the 1:7" twist rate, and McNett set out to create a defensive load for law enforcement and civilian use that would deliver maximum energy to the target. After months of testing, he determined that 80 grains was the heaviest bullet possible for that twist rate. Double Tap's new 80 gr. defensive load uses Nosler Custom Comp hollowpoint boattail bullets in nickel-plated cases. This bullet has a longer ogive to give it a much higher ballistic coefficient while running at the same speed as the more popular 77 gr. load, providing longer range, a flatter trajectory, and increased terminal velocity with absolutely no down side. MV is 2,825 FPS out of a 22" barrel producing 1,418 ft. lbs of kinetic energy at the muzzle. See it at your firearms retailer or contact..."
edit: it's still not on their website.