Sub-caliber round

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A Kinetic energy penetrator, an example of a Sub-caliber round.
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A Kinetic energy penetrator, an example of a Sub-caliber round.

A Sub-caliber round is a round whose diameter is inferior to the barrel diameter.

Because the round does not shut the chamber close, an expendable part (called a sabot) is required to expand the diameter to the full barrel width of the firing gun.

The most used sub-caliber rounds are flechettes and Kinetic energy penetrator tank shells.

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