The only ammunition that's banned in Hawaii is as follows, per HRS 134-8: "...any type of ammunition or any projectile component thereof coated with teflon or any other similar coating designed primarily to enhance its capability to penetrate metal or pierce protective armor; and any type of ammunition or any projectile component thereof designed or intended to explode or segment upon impact with its target."
According to my trusty Word Tech Manual, segment as a verb means "to cut or divide (a whole object) into segments", so the straight dope is, you can't have ammunition coated with teflon or other substances which are primarily designed to enhance performance on body armor, and you can't use the exploding bullets that I've never been able to find anywhere, anyway. In all honesty, of all the ammunition that's out there, the only thing you can't have in Hawaii is frangible ammunition.