Most frangible ammo is made by compressing powdered metals-copper and tin, are common. The density of the material is far short of lead, thus producing a "light" bullet. There are in fact some frangible bullets that have been mfg out of polymer and tungsten (1cc of tungsten is heavier than 1cc of gold), these rounds have amazing penetration into gel. By adjusting the "mixture" the mfgs are able to produce bullets with the same size and shape and weight as a conventional jacketed round. They are extremely deadly, the problem-they are also very-very expensive. If you ever get a chance to test some, or get a chance to see a test, you'll be surprised to say the least, I know I was.
Last edited by pawprint2; 05-23-2013 at 20:31..