Well I found a nest and one ingot mould of several rusted up. I should have scrubbed and wire brushed it but l didn't. First cast was fine. Figured, ok...Dumped and refilled one cell to hear a firecracker sound and splatter.
Glasses saved my eyes. Shirt and pants are trash. Deck cleaned up pretty well.
Done for the day.
Lesson learned, don't get complacent just because it didn't happen before