Round shot was made in early times from dressed stone, but by the 17th century, from iron. It was used as the most accurate projectile that could be fired by a smooth-bore cannon, used to batter the wooden hulls of opposing ships, forts, or fixed emplacements, and as a long-range anti-personnel weapon.
Round shot has the disadvantages of not being tightly fitted into the bore (to do so would cause jamming). This causes the shot to "rattle" down the gun barrel and leave the barrel at an angle unless wadding or a discarding sabot is used.
Pellet shot (now simply called 'shot') is still used in shotguns.
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