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

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
Shotshell Types There are three distinct types of shotgun loads: Pellets, or shot; slugs, i.e., a full-bore projectile; and sabot rounds, i.e., a subcaliber projectile often with a plastic sabot.
A sabot is a lightweight carrier in which a subcaliber projectile is centered to permit firing the projectile in the larger caliber weapon.
By using this method, a slightly subcaliber projectile could be easily loaded without the time-consuming patching or hammering.