Jacketless hunting bullet with roll-back cutting flags

• US 4,044,685 A
• Filed: 02/27/1976
• Issued: 08/30/1977
• Est. Priority Date: 06/18/1971
• Status: Expired due to Term

• Current Assignee: Hirtenberger Patronen- Zundhutchen- und Metallwarenfabrik AG
• Original Assignee: Hirtenberger Patronen- Zundhutchen- und Metallwarenfabrik AG
• Inventors: Avcin, France
• Primary Examiner(s): Tudor, Harold
• Application Number:
  US05/662,166
• Time in Patent Office: 550 Days
• Field of Search: 102/91, 102/92.1-92.6
• US Class Current: 102/508
• CPC Class Codes: F42B 12/34 expanding before or on impact, i.e. of dumdum or mushroom type

Abstract

A jacketless hunting projectile or bullet of the mushrooming-tip, high cutting-type has a projectile body including a solid cylindrical guide part and a hollow head tapering toward a point. The hollow head has a progressively increasing wall thickness toward the solid part of the bullet and defines a cylindrical hollow space which receives a filling of a spreading material forming the tip of the projectile. This material rolls back the head after splitting it along notches formed in the hollow wall with sharp edges.

Claims

1. A jacketless hunting bullet comprising:

a one-piece projectile body having a solid cylindrical portion extending over at least half the length of the bullet and a frustoconical head converging away from said solid cylindrical portion, said head being formed with a generally cylindrical chamber extending over the entire length of only said frustoconical head, terminating at said cylindrical portion and defined by an internal wall, said chamber opening at the small-diameter end of the frustoconical head and being surrounded at the latter end by a thin wall portion of said head, said wall being formed with a plurality of angularly equispaced axially extending grooves of constant V cross section with the wide part of the V being open toward the axis of said body, said grooves extending the full length of said generally cylindrical chamber, said grooves having depths of substantially half the wall thickness of said wall portion; and

a mass of plastically deformable material filling said chamber and projecting therefrom at said end of said head to form a tip for the bullet, said tip having an outer surface flush with the external surface of said head at said portion, said mass reaching substantially to the solid cylindrical portion, said head having a length L_b, said body having a total length (L_a +L_b), said solid cylindrical portion having a diameter D, said chamber having a diameter d and the parameters L_a, L_b, D and d being related so that the ratio d;

D is about 0.50±

0.15;

the ratio d;

L_b =1;

3 to 1;

4; and

the ratio (L_a +L_b)/D=4.0±

1.0.

2. The bullet defined in claim 1 wherein said mass constitutes up to 15% by weight of the bullet, said body constituting the remainder thereof.