While seeing the series Black sails, there's an episode where two guys face each other in a pistol duel. While preparing the weapons, it is clearly seen that the assistants put a piece of cloth wrapping the bullets. Why is it done?
2 Answers
Not sure about wrapping a bullet entirely, but muzzleloading firearms do generally require a patch of some kind (typically some sort of cloth or paper) between the ball and the powder. This is because the ball is made to be a slightly smaller diameter than the barrel, so it doesn't get stuck in the barrel while loading. If the gun was fired without a patch, the gases could escape around the ball, greatly reducing the velocity imparted to it. The patch provides a seal to keep the expanding gases trapped behind the ball, so the only way they can escape is by pushing it outwards.
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This is the origin of "buckskin coats"; the leather strips were for torn off for padding of the musket balls. Clearly only dudes would have ever been caught in a pristine buckskin coat. Commented Jun 27, 2016 at 21:46
To elaborate on Patrick N's answer, the cloth is called "wadding."