Sub-caliber round
A sub-caliber round is a round the diameter of which is significantly smaller than the barrel diameter. An expendable sabot is used to increase the diameter to the full barrel width of the firing gun.
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A kinetic energy penetrator, an example of a sub-caliber round.
Sub-caliber rounds include flechettes, saboted light armor penetrators, and kinetic energy penetrator tank shells.
See also
Sub-caliber training - use of sub-caliber weapons, attachments, and/or ammunition for training with larger weapons
References
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