For your first pour, you did excellent. A few suggestions.
You don"t need to use a cooking oil with the shape of your steel mold. Once the lead cools, it will slightly contract away from the sides of the mold. A better tension release agent would be paraffin wax with bees wax being the best. Skimming with bees wax will also clean off the dross (scum).
Your lead was at a very high temperature according to your ingot face. Too high of a heat on any metal will destroy some of the metals properties thus you will have a very poor metal to work with. About 900ºf maximum for Pb. Pure Pb is liquid at about 450ºf and wheel weights about 500º to 550º as wheel weights contain a small amount of antimony and a few other trace metals.
Always preheat your mold as your mold will retain water with-in the surface pours of the steel. If you hear a popping sound as your pouring the mold, this is small steam explosions taking place because of moisture.
Always turn your concrete blocks with the inside holes facing up, or 90º from what"s in your pics. There very strong facing up and very weak on the side.
Alot of accidents happen on the 2nd or 3rd try as a person gets relaxed as the first time went so well. Be careful!
Hot molten metal is just like tar on the skin. You have to wait until it cools before you can remove the metal. If you try too remove the metal/tar while still hot and burning, you will smear the burn over a larger area. For safety, this is a two man job.
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