Compression projectile
Compression projectile Com*pres"sion pro*jec"tile 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 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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