| 摘要 |
There is described a cylindrical bullet or projectile having imbedded coaxially in lead or like bullet metal, a internal expansion control insert of copper or like bullet-jacketing metal. The insert has a cylindrical outer surface having a common cylindrical interface with the outer portion of the bullet. The inner surface of the insert has a star-shaped configuration constituted by lead-filled, axially-disposed, V-shaped channels the apices of which are adjacent the outer surface of the insert and the sides of which flare out symmetrically about radii to an intercept with the hollow core of the bullet which extends from a position at or near the base of the bullet as a cylindrical surface to a position at or near the nose of the bullet whereupon it extends on an inverted, frusto-conical surface to the nose-end of the bullet. The points of the stars are truncated on an arcuate surface and the base of the lead-filled channels have a complementary curvature so that the inner surface of bullet is formed of arcuate panels of lead alternating with arcuate panels of malleable bullet-sheathing copper. These panels are shaped by an axial core of the mold which has a top shaped as an inverted, frustrum of a cone and sides that first are parallel and then coverage to a point at the nose-end of the bullet. The bullet thus has a plurality of segments that are separated by portions of weakness and peel back on impact to effect mushrooming of the bullet.
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