Been pouring big 5/8 and bigger Ultra Spinner mold, soft lead is best, but harder lead is workable if on a tight budget. I get my lead from the local tire shop for free. Use masking tape shim where handles close on mold to allow air to escape and make sure mold is preheated along with hooks and wire forms. Pour fast and don't let the mold cool down. I probably don't have as much experience as the other guys but this works for me on about 95% of the heads I pour. The 5% with defects get used in other tackle making experiments. Either way good luck and never stop learning from these guys.
