Sub-caliber round
From Infogalactic: the planetary knowledge core
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A kinetic energy penetrator, an example of a sub-caliber round.
A sub-caliber round is a round the diameter of which is inferior to the barrel diameter. An expendable sabot is used 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.
References
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