A 16oz. ball pein hammer might make a fine throwing hawk. A 16oz. claw hammer could work, too, if you chop off the claws and reshape it, a 20oz. head would be even better. You can find tomahawk material at garage and tag sales if you look, especially if you dig to the bottom of boxes full of rusty junk. I never pass up a rusty hammer head for a quarter. Heck, I might even go as high as fifty cents or a dollar if it suits my fancy and is a fine design.