Thanks for the reply Charles,
I recently had to sell my fn 5.7 after I fell on some hard times, and I'm investing in a much cheaper Baretta 9mm. I would love to be able to cast steel rounds, and simply add a copper jacket. The lowest velocity rounds for the 5.7 were about 2200 fps, and going to a 9mm is a major drop in velocity. The goal of this venture of mine is to hand load a round that can defeat a trauma plate since plates and vests are widely available to the general public now for a fairly low price, and you never know what you may run into in a home defense situation these days. The most durable bullet molds I found were cast from steel, but as my knowledge on the subject is quite limited im not even sure if I could use these with molten steel