Ammunition and explosives – Projectiles – Dumdum or mushrooming
Patent
1991-06-03
1995-03-28
Tudor, Harold J.
Ammunition and explosives
Projectiles
Dumdum or mushrooming
102517, F42B 1234
Patent
active
054007160
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a deformation bullet with a one-piece bullet body which is made of tough-deformable material and includes a rear, generally cylindrical guide part and a front head part tapering toward the nose of the bullet, and with a charge made of easily deformable expanding material and arranged in a cavity of the head part which cavity extends concentric to the bullet axis and is open at the nose of the bullet, with the charge causing a peeling and expanding of the cavity-surrounding jacket of the head part upon impact.
Such deformation bullets are primarily used for hunting, and their effectiveness is based on the fact that upon impacting of the bullet in animal tissue, the bullet head mushrooms to thereby attain a great expansion of the entry channel of the bullet and an increased shock effect in order to accomplish a quick kill of the quarry. In contrast to so-called fragmentation bullets, the bullet not only retains its coherence and does not cause any fragmentation but also exits from the body of the quarry at enlarged exit hole in comparison to the entry hole.
The DE-OS 22 28 733 describes a hunting bullet of the above-stated type, with a bullet body which, except for the expansion material in the cylindrical cavity of the bullet nose is made of massive tombac. The tombac material can be made sufficiently hard in order to allow shaping on a lathe and to reduce deposits in the barrel of the firearm. However, a respectively hard material diminishes the ability to adapt to the inner contour of the barrel so that the interior ballistics of the bullet becomes impaired. Moreover, the charge of expansion material, which after opening of the bullet nose inevitably spreads in the animal body, still makes up an undesirably high share of the total weight of the bullet.
The DE-OS 36 38 721 discloses a deformation bullet, with a bullet body having a continuous recess extending from the nose to the flat bullet base and accommodating a rear core of lead and a front core of lead or of a material free of lead. An inner jacket surrounding the rear core is interlocked with the outer jacket by at least one depression to prevent the rear core from being forwardly propelled upon impact of the bullet. It is, however, questionable whether a form-fitting interlock of this kind can withstand the forces released on bullet impact and is sufficient to hold the rear lead core. Rather, an essentially complete fragmentation of this bullet could be expected.
U.S. Pat. No. 3,003,420 describes a so-called two-compartment-bullet which, however, is to be classified as a type of fragmentation bullet since about 40% of the mass, the entire lead charge (12) of the forward bullet compartment are lost in the body of the game as unequivocally shown in FIG. 4 of U.S. Pat. No. 3,003,420. Further, the mass distribution of the charges is unfavorable since the forward charge has a greater mass than the rearward charge. Moreover, the configuration of the partition between the forward and rearward bullet compartments results in an increased pressure within the barrel, leading to drawbacks when it comes to interior and exterior ballistics, and further to a disadvantageous prolongation of the bullet at nominal weight in comparison to other bullets, preferably the present invention.
The invention is based upon the invention to provide a deformation hunting bullet of the above-stated type which has improved interior ballistics and ensures the coherence of a major part of the bullet mass at superior deformation effect.
According to a further development of the invention, a method of making a bullet of this type is disclosed which provides the bullet with interior ballistics and terminal ballistics which are precisely pre-programmed and suited to the strength of the propellant charge used with the bullet.
This object is attained in accordance with the invention by a deformation bullet of the above-stated type which is characterized by a bullet body with a guide part having a cavity concentric to the bullet axis and containing a charge of hea
REFERENCES:
patent: 1730871 (1929-10-01), Aronson
patent: 2891298 (1959-06-01), Kaul
patent: 3003420 (1961-10-01), Nosler
patent: 3282214 (1966-11-01), Briscoe
patent: 4044685 (1977-08-01), Avcin
patent: 4136616 (1979-01-01), Schirneker
patent: 4742776 (1988-05-01), Scuto
Feiereisen Henry M.
Tudor Harold J.
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