I bet it was not molten when it was poured. If it was, it would have badly burned the stock wood, possibly started a fire and for sure it would not neatly fill the hole as the wood would continue to char long after the metal had frozen. I would guess that the lead was poured into some sort of mould and then fitted into the hole in the butt. Do not try to pour lead into a wooden hole. You will not like the results and if there is moisture I can imagine it would be fairly dangerous to boot.

Brent

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BrentD, (Professor - just for Stan)
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