+1 With what Stick Man said about keeping a hotplate warm along with the melting pot being hot. Most ( not all ) hotplates only get up to 600 degrees max and are great for pre-heating and keeping your moulds warm during casting sessions. This has all but totally eliminated culls during casting for cold casting wrinkles and poor cast definitions on the bases etc. when I am doing long casting sessions. Use a casting thermometer such as Lyman, RCBS, Rotometals etc. to determine the best casting temp for a certain alloy using a certain mold teamed with the hotplate preheat gig and you can return back to casting those perfect bullets time after time in short fashion. I love casting but hate culling and recasting especially using single cavity moulds.
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