Print the wax model, and cast it in steel. If you are using the lost wax process, just use steel, instead of the bronze. But like the others have said bronze arrow heads were used a lot, as at the time iron was difficult to get. Steel, didn't come along till around when the Vikings perfected the process of making steel from iron. Then it spread all over. There was a show on the history channel, that showed a Chinese tomb they had unearthed, and there were bronze swords, that were still literally razor sharp!