Compression projectile

Com`pres´sion pro`jec´tile


1.A projectile constructed so as to take the grooves of a rifle by means of a soft copper band firmly attached near its base or, formerly, by means of an envelope of soft metal. In small arms the modern projectile, having a soft core and harder jacket, is subjected to compression throughout the entire cylindrical part.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.