The details pertaining to Hawaii ammo laws are meant as a reference point only. As you're likely aware, Hawaii firearm laws change frequently and we're not lawyers, so be sure to consult your local law enforcement agency or an attorney before making any final firearms related decisions.
In addition to federal restrictions on armor-piercing ammo, the State of Hawaii prohibits teflon-coated ammo and other armor-piercing ammo. The State also prohibits the sale and possession of pistol magazines with a capacity of more than 10 rounds. Additionally, all federal firearms and ammo laws apply in Hawaii.