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The shot pellets were just heated and poured back into the shell.
Reason: so the poured in molten wax would trickle all the way through the shot column (and not solidify/set in the top half inch or...

Then there’s the old trick of opening the crimp, tipping the shot onto a plate which was placed on the coal range (told you it was an old trick) to heat up the pour the shot back into the shell and...