how does swaging work? I am considering purchaseing mr. blackmons die for make .223 jackets from .22. however i have a terminal case of dumb *** and cannot understand how it works. I mean i can see how the jacket is made but how do you fill it? do i have to buy a mould and cast cores then somehow insert them into the jacket? or do you place the jacket into a mould and then somehow fill it with lead. Please help! I am so confused!