Bullet and method for expanding a bullet

Abstract

During impact of an opening solid-material bullet, a slightly concave or substantially blunt-nosed nose structure of at most 1.2× caliber is provided to such a bullet by mushrooming to generate a blast wave. The bullet opens to a size that is 1.1 to 1.15× caliber. The mushrooming is achieved by arranging on the nose of the bullet a cavity that is in the direction of the center axis of the bullet and has a substantially even-sized diameter.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a bullet according to the preamble of claim 1 and a method according to the preamble of claim 6 for providing the expansion of a bullet when it hits its target. This type of bullet is especially well suited for hunting big game, where it is important that the bullet expands, but it is also necessary to avoid excessive fragmentation of the bullet.[0002]When a sharp-nosed bullet advances in its target, in the muscle mass of a game animal, for example, it displaces tissue on its way. This displacement time of the tissue caused by the bullet corresponds to a time, in which the bullet travels at its advancing velocity a distance, during which the tissue displaces from the nose of the bullet to the biggest outer diameter of the bullet. The shorter this displacement time is, the bigger a blast wave the bullet generates and, at the same time, the bigger the cavitation bubble following the bullet and the trauma caused by the h...

AI Technical Summary

Benefits of technology

[0013]This type of substantially blunt-nosed or slightly concavenosed bullet provides an as short displacement time of tissue mass as possible in the targeted game animal due to the substantially planar surface formed on the nose of the bullet. A blunt-nosed or slightly concave bullet generates a strong blast wave as it advances in the tissue mass. At the same time, the small surface area of the nose of the bullet impacting the tissue mass leads to a low advancing resistance and high penetration of the bullet.

[0014]Such a bullet according to the invention displaces tissue mass rapidly, in which case the strong blast wave it generates has the strongest effect on liquid-containing tissues, such as lungs. As the cavitation bubble formed by the bullet in the muscle tissue is smaller than before, tissue damage to the muscle mass also remain smaller than before.

[0015]When the present bullet impacts, a better than before stability is achieved, because the shape of the front surface of the bullet is a symmetrical plane and because the centre of gravity is, differing from earlier, essentially in the midpoint of the bullet. In addition the symmetry of the front surface further diminishes the turning forces acting on the bullet as the impact angle of the bullet changes, and the gyro force caused by the rotation is not cancelled. The result is a deep linearly advancing penetration without a change in direction.

[0016]On the basis of conducted tests, it has been detected that a so-called solid-material bullet can successfully be replaced by an only slightly mushrooming solid bullet of the invention without losing killing power. By replacing the strong flesh-destroying cavitation effect generated by the large mushroom of prior-art bullets with a controlled blast wave, it is also possible to successfully minimize the all too common flesh damage in hunting.

[0017]This way, a bullet is produced that makes it possible to shoot with the same weapon and bullet both small deer, without making it inedible, and African dangerous game, providing the used calibre is sufficient for the purpose. At the same time, the bullet is designed to meet the requirements of the Nordic hunting legislation to a sufficient extent.

Problems solved by technology

In practice, this means that the higher flying velocity of the bullet increases the trauma generated in the game animal being hunted, because the time, during which the tissue must move, decreases as the flying velocity increases.

As a result of this, the bullet rotates around its longitudinal axis, which results in an unforeseeable direction of travel and a very small penetration.

However, there are significant drawbacks related to the use of these prior-art bullets.

As a result of this, the bullet may pass through the target without opening, or it may open too much or even break.

This type of bullet also produces a very strong blast wave that results in tissue damage on the surface of the target and a very limited penetration as a consequence of the decrease in velocity.

This damage caused by the bullet in turn lead to the fact that some of the felled game is inedible either due to the deformations or the bullet fragments in it.

However, such bullets that become blunt-nosed require high velocity during shooting to ensure their deformation.

This results in similar damage to the game as with the mushrooming bullets described above, because the bullet opens momentarily into the same shape as the present mushrooming bullets.

However, these bullets have very bad external ballistics that leads to a more curved trajectory than is usual.

Blunt-nosed bullets of this type are mainly only suited for break-action weapons, because due to their structure they feed poorly from the chamber to the breech.

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