Subcaliber projectile

a projectile having a smaller diameter than the caliber of the arm from which it is fired, and to which it is fitted by means of a sabot.
- Knight.

See also: Subcaliber

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References in periodicals archive ?
By using this method, a slightly subcaliber projectile could be easily loaded without the time-consuming patching or hammering.
A sabot is a lightweight carrier in which a subcaliber projectile is centered to permit firing the projectile in the larger caliber weapon.