Most likely your mold was either too cold or the lead was or both, they would be shootable but don't expect stellar results still not bad for a first attempt.
Beeswax and lard is a traditional lube but candle wax with a bit of oil added so its a bit soft works fine. Stand the bullets in a tray and pour the melted lube in till it is just above the first grease groove let it cool and then cut the bullets out using a fired case with the base cut off and they are ready to load.
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