Mushroom-bullet.

Application filed February 24.1914. Serial No. 820,624.

To all whom it may concern:

Be it known that I, Frank 0. Hoagland, a citizen of the United States, residing at Bridgeport, county, of Fairfield, State of 5 Connecticut, have invented Improvements in Mushroom-Bullets, (Case D,) of which the foilowing is a specification.

This invention has for its object to produce a well balanced bullet of full weight, 10 haying a two-part cover and a core entirely filling the cover, and which will mushroom, ί. e. flatten out, upon impact. This result I. accomplish by dividing the tapering porfh®· °f the bullet into a plurality of sections .15 of progressive diameters terminating in steps or shoulders.

In the accompanying drawing forming a part of this, specification, Figures 1, 2, and 3 are elevations partly broken away, illus20 trating variant, forms in which I have carried the invention into effect, and Fig. 4 is a view showing the bullet mushroomed by impact.

1.0 denotes the core of my novel bullet 25 which is made of relatively soft metal, 11 the body cover and 12 the tip cover. In order to impart to the bullet the mushrooming quality without lightening it to the slighest extent or changing its balance, I 30 roll, swage or otherwise form in the tapering portion of both the tip cover and the core a plurality of annular grooves or depressions thus forming shoulders or steps which may be more or less abrupt and are 35 progressive in diameter.

In the form illustrated in Fig. 1, the grooves are in the form of a rip;ht angle and divide the tapering portion of the bullet into cylindrical sections 13 terminating in 40 shoulders 14 at right angles thereto. The diameters of the sections vary progressively, each section except the two end ones having ^a shoulder at each end. . The shoulders at the front ends of the sections extend inward 45 toward the axis of the bullet, each intersecting the base of the next smaller section ¹¹⁴ i'°^{nt an}-^{d the sIlouI}ders at the rear ends of the sections extend outward; each intersecting, the front end of the next larger cylindrical portion in the rear thereof. 50

In the form illustrated in Fig. 2 the grooves are in the form of an obtuse angle lhe sections, indicated by 15, taper slightly from the base toward the tip and the shoulders, indicated by 16, incline outward and 55 forward from a diametrical line through the front end of the larger of the two sections connected by the shoulder.

. In the form illustrated in Fig. 3, the sections, indicated by 17, are shown as tapering 60 substantially as in Fig. 2 and the shoulders, indicated by 18, incline inward and backward from a diametrical line through the front end of the larger of the two sections connected bv the shoulder. It should be 65 understood, however, that the special configuration of the sections and shoulders is ™olly immaterial so far as the principle the invention is concerned, the gist of which lies in the division of the tapering 70 portion of the bullet into sections of progressive diameter, terminating in shoulders, lhe effect produced by the formation of ^aunul ar grooves in the tapering portion of the bullet, i. e. the dividing of that portion 75 of the bullet into sections of progressive diameter terminating in shoulders, is to increase the resistance of the objective to the passage of the bullet, so that the bullet is retarded, slowed up. The formation of the 80 grooves moreover stretches and weakens the metal of the tip cover sufficiently so that upon impact of the bullet with an objective the successive sections will telescope, the tip cover will be ruptured and the entire for- 85 ward end of the bullet will mushroom, as indicated m Fig. 4.

. In order to prevent the possibilitv of the ?P cover becoming detached from the core, loldmg points 21 may be struck out from 90 the metal of the tip cover and forced into the core, as clearly shown in the drawing.