I tried casting some maxi-balls in a new-to-me aluminum block mould using soft lead. I had issues with mould fill out. I don't have any other experience with aluminum blocks or with just lead. My previous experience has been with steel mould blocks and with alloys that had some tin to help with fill out. My Lyman thermometer showed a temp of 700 degrees and I was using a hot plate to warm the mould block. Anything I should do to help the soft lead get into the nooks and crannies?