Sprue Metal Draw Down

Lead in the sprue is drawn down into the bullet cavity as the lead cools.

Sprue Metal Draw Down is explained in:
Lyman Cast Bullet Handbook Third Edition
Page 58
First column
Fourth paragraph after Casting Bullets.


Narration:
When casting be generous with the sprue.
As the lead cools, see the depression in the sprue where the metal is drawn down into the bullet cavity.

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