EP1728043B1 - Hunting bullet comprising an expansion ring - Google Patents

Description

The present invention relates to ammunition for small arms, medium and large calibres, and more particularly advanced ammunition, especially for hunting weapons, having improved efficiency, by a target expansion.

Shotgun bullets are typically divided between bullet-sized bullets and under-calibrated bullets.

Conventional bullets in the caliber of the weapon are usually made of lead or lead alloy. They do not fragment and expand only very slightly to the impact on the target. Some involve breakage primers that cause fragmentation of the bullet body on impact. These bullets are fired at relatively slow speeds, less than 500 m / s, and are ineffective on medium or strong targets such as large game, such as wild boar.

Sub-calibrated bullets include a sub-projectile, possibly stabilized by empennage, associated with a launch pad, the caliber of the weapon, which separates at the exit of the barrel of the weapon.

All these conventional balls have drawbacks generally related to their imprecision, their ballistic dispersion and their lack of effectiveness on targets with hard parts.

So-called expansive bullets, which deform upon impact by mushroom-shaped expansion, including on medium-strength targets, have been described in the art. For example, the patent US Patent 4,685,397 describes a bullet with an ogival body whose head comprises a blind hole closed by an insert capable of sinking into the hole during impact, and to push outwardly the wall of the nose. The patent EP-A-918208 discloses another embodiment of such a cylindrical body bullet and ogival head having a blind hole along its axis, closed by an insert, supplemented by a peripheral annular groove. Thus, on impact, the insert sinks into the blind hole and then causes deformation by expansion of the ogival head, which is facilitated by the annular groove. Requirement PCT WO 03.093758 discloses a partial expansion and fragmentation ball having an orifice located in the head of the warhead, completely closed by a plug mounted on a rod, the movement of which causes deformation of the body of the bullet.

However, the expansive ammunition of this type has the disadvantage of a random control of the deformation according to the shooting conditions, with a risk of fragmentation of the ogival head of the bullet.

More advanced ammunition for hunting weapons has been developed on the principle of the arrow bullet. Ammunition of this type is described for example in the patent FR-A-2555728 . During the impact of ammunition of this type on the target, the arrow deforms, and it is desirable that this deformation be controlled and does not provide an excessive dislocation of the arrow in several small fragments that could be dangerous . The patent FR-A-2795170 describes ammunition that meets this objective, and essentially consists of a bullet of the caliber of the weapon or under-calibrated, comprising a profiled front portion, a central portion, and a rear portion that can carry an empenne, and comprising, arranged along its axis, an internal arrow carried, of rigidity at least equal to that of the body of the ball. The balls of this type are very precise and have the advantage of maintaining their mass during the impact on the target. According to this technique, the diameter of the nose of the warhead is between 40 and 50% of the maximum diameter of the bullet, which gives it a significant aerodynamic drag. These bullets are therefore mainly intended for so-called "beat" firing, at short and medium distances, less than 150 m for rifles, and of the order of 50 to 60 m for shotguns.

Another type of ammunition where the bullet body has an orifice completely closed by a shutter is described in the patent US 6,349,651 , but the shutter is supported on the front of the bullet body. A variant of a delayed-expansion hunting bullet is described in the patent EP 1.394.498 according to which the bullet body is completely traversed by an element which, on impact, causes deformation of the bullet body. The patent DE 19903395 discloses a bullet having an enlarged base metal core, supporting an open ogival head envelope prominent with respect to the central core.

The ballistic performance of ammunition of this type, however, is reduced when fired from shotguns where the initial speeds are relatively low, that is to say less than about 600 m / s. In addition, their relatively high aerodynamic drag has the effect of limiting the speed of impact on the target. It is known that the impact velocity on the target, the mass of the bullet and its configuration, are the three essential parameters that must be controlled to achieve good stopping power by cavitation effect in the target.

Thus, there is still a need today to be able to dispose of ammunition, especially for hunting weapons, having a controlled expansion at impact, in particular on low resistance targets, ensuring an effective release of their energy.

The purpose of the present invention is precisely to optimize the terminal ballistics of a lead-free metal ball of the above type, in order to provide accelerated expansion, while avoiding the loss of mass by fragmentation and by ensuring excellent efficiency on the hard parts possibly present in the target.

The invention also relates to a hunting weapon ammunition, as mentioned above, providing an accelerated expansion during the impact on the target, in particular on a low or medium resistance target.

The subject of the invention is also an ammunition for hunting weapons with improved terminal efficiency on medium or low resistance target, constituted by a cartridge, consisting of a primed sleeve, a powder charge propulsive, and a complete ball, if any associated with a launcher the caliber of the weapon.

The invention finally relates to a lead-free ammunition for hunting weapons having an optimized terminal ballistics, providing an almost total release of energy in the soft parts of the target, avoiding any fragmentation of the bullet on impact.

The present invention is applicable to ammunition of small, medium or large caliber, the type of the caliber of the weapon or under-calibrated, for hunting weapons with smooth or striped barrel.

The ammunition for small arms, medium and large calibres, according to the present invention is constituted by a bullet of the caliber of the weapon, or sub-calibrated, of the type comprising a substantially rigid body of ball and a deformable part, and it is distinguishes in that the deformable portion is constituted by a substantially cylindrical expansion ring whose rear portion is mounted on the front portion of the bullet body.

According to a preferred embodiment of the invention, the cylindrical expansion ring is fixed by its rear part on the bullet body, and the attachment may be advantageously detachable from the bullet body.

It is preferable that the expansion ring comprises means cooperating with the bullet body to prevent its recoil during impact on the target so that the energy released on impact is partly absorbed by the deformation of the target. the ring. These means may be constituted by a stop secured to the rear portion of the ring, bearing on a shoulder on the bullet body. It may be advantageous to provide that the bale body has a shoulder against which abuts the rear face of the cylindrical ring.

According to a complementary characteristic of the invention, the expansion ring comprises on its front face an opening frustoconical bore, cooperating with the front face of the head of the bale body to form an open cavity. The volume and the opening angle of this cavity are determined according to the desired results, by applying conventional calculation methods to achieve the maximum stopping power on the target, by effect of dilaceration, penetration and hydrodynamic cavitation.

Advantageously, the frustoconical bore opening on the front face of the expansion ring is designed to form with the outer cylindrical portion of the ring, a flat or a narrow expansion lip, which facilitates the movement of the ring. expansion of the ring at impact on the target.

According to an advantageous characteristic of the invention, the base of the opening frustoconical bore comprises an annular bearing bearing against the cylindrical surface of the head of the bullet body and slidable on it. This annular bearing is separated from the rear part of the cylindrical ring by an annular groove.

The annular bearing ensures a deformation by regular expansion of the ring by preventing misalignment with respect to the axis of the ball. It also maintains the ring from all angles of fire, including tangential shots generating significant radial forces. Finally, it contributes to the good grip of the ball in the case of an impact on the ground by maintaining the ring in the axis of the bullet body, and thereby decreases the propensity to lateral ricochets of the ball, and thus increases shooting safety.

The outer surface of the expansion ring is generally cylindrical, but it may be slightly curved and have a low taper, especially in the case of caliber bullet. According to a preferred embodiment, the outer surface of the cylindrical ring has a curvilinear ogival shape.

In general, the front face of the expansion ring is substantially in the plane of the face of the ball body head. However, depending on the desired effect, it can be projecting, which reduces the aerodynamic drag, or on the contrary slightly recessed.

The bullet body comprises a front part supporting the expansion ring, of cylindrical shape ending in a conical or frustoconical tip. This part constitutes an arrow intended to fragment the hard parts possibly present in the target.

The terms "front part" and "rear part" used herein respectively denote the front or back of the ball, in the direction of the shot. Thus, the arrow corresponds substantially to the front part of the bullet body.

The body of the bale may be for example copper, preferably copper heat-treated or mechanically to increase its hardness and rigidity, or brass containing 5 to 40% zinc and 95 to 60% copper, preferably brass containing 20 to 30% zinc, or metal alloy having the desired mechanical properties, for example aluminum alloy, or composite material based on tungsten or bismuth. Compared with conventional techniques, the technique of the invention has the advantage of allowing the lead to be completely or partially replaced by another metal or alloy known to be non-polluting. In the case of a stabilized bale stabilized, the empennage may be metal or polymer formed by plastics directly on the metal body of the sub-projectile.

As indicated above, the bullet body used in the ammunition of the invention advantageously comprises a front part comprising an arrow of revolution. The bullet body and the arrow are preferably made of the same material, for example copper or brass, the arrow being machined directly on the bullet body. The arrow usually has the shape of a rod or a cone of revolution, coaxial with the projectile. It is advantageous to provide ribs or bearings on the outer surface of the boom to improve attachment of the expansion ring. It may be for example annular or helical ribs, cooperating with means provided on the inner face of the ring.

According to alternative embodiments according to the invention, the expansion ring is attached to the bullet body by screwing, by friction welding or by hooping, or by force fitting, for example by means of a contact surface knurled in diamond points.

The expansion ring is preferably made of metal or metal alloy, for example brass, of lower or equal rigidity, and preferably lower than that of the bullet body. This difference in stiffness between the bullet body and the expansion ring can be obtained for example by choosing brasses with an appropriate zinc content. Breaking primers may be provided on the expansion ring. These breaking primers, cooperating with the more rigid boom, promote deformation of the head of the bullet during the impact by "mushrooming" around the central deflector which retains its general shape and serves as a structure ensuring the cohesion of the 'together. They can be associated in combination with circular or longitudinal grooves made around the bead, preferably in the zone deforming by expansion, whose deformation must be controlled.

As indicated above, the ball may be of the gyroscopic stabilization or empennage type. The gyrostabilized bullet is used in a rifled barrel, so that the scratch of the barrel, cooperating with a tenon integral with the bullet, gives it a rotational movement along its axis. Stabilized bullets can be used in smooth-bore weapons.

The launch pad, in the case of an under-calibrated bullet, may be in accordance with those described in the patents FR-A-2606500 and FR-A-2708730 .

The ammunition of the present invention can be used on relatively hard and high strength targets, as well as soft targets of low strength on which they provide excellent terminal efficiency. This excellent efficiency results in particular from the effect of controlled expansion on impact, after perforation of the hard and resistant parts possibly present in the target. It is obtained while maintaining the aerodynamic parameters of the approach bales with an internal arrow carried using the technique described in the patent FR-A-2795170 above, even at significant distances, of the order of 300 m and more in the case of gyro-stabilized bullets. The point of impact is then identical to that of the above-mentioned approach booms with the aerodynamic parameters and the construction of the ball in flight order.

In addition, firing safety is ensured from all angles of fire on the target, including tangential angles through the open cavity formed on the front of the bullet, combined with the relatively small diameter of the tip of the ogival head. , thus limiting the propensity for ricochets.

The ammunition of the invention is therefore particularly suitable for hunting small or medium game, but may also be suitable for large game with relatively thick and resistant skin.

• Fig. 1 : une demi-vue schématique en coupe partielle d'une balle sous-calibrée stabilisée par empennage, suivant l'invention, pour fusils de chasse.
• Fig. 2 : une vue en coupe partielle de la balle de la Figure 1, expansée après pénétration dans la cible.
• Fig. 3 : une vue schématique en demi-coupe d'une variante de réalisation de l'invention, représentant une balle au calibre, plus particulièrement adaptée aux carabines de grande chasse.
• Fig. 4 : une vue schématique en coupe de la bague de la balle représentée sur la figure 3, après expansion à l'impact sur une cible à résistance élevée, et séparation du corps de balle.
• Fig. 5 : une demi-vue partielle, en coupe partielle, d'une variante de la partie avant de la balle de la Figure 1, comportant une liaison filetée entre la bague d'expansion et le corps de balle.
• Fig. 6 : une demi-vue partielle, en coupe partielle, d'une autre variante de la partie avant de la balle de la Figure 1, comportant une liaison frettée entre la bague d'expansion et le corps de balle.
• Fig. 7 : une demi-vue partielle, en coupe partielle, d'une autre variante de la partie avant de la balle de la Figure 1, comportant une liaison moletée en pointes de diamant entre la bague d'expansion et le corps de balle.

The characteristics and advantages of the invention will appear in more detail in the following description relating to nonlimiting examples, with reference to the appended drawings which represent:

• Fig. 1 : A schematic half-view in partial section of a sub-calibrated bullet stabilized by tail, according to the invention, for shotguns.
• Fig. 2 : a partial sectional view of the ball of the Figure 1 , expanded after penetration into the target.
• Fig. 3 : A schematic half-sectional view of an alternative embodiment of the invention, representing a bullet caliber, more particularly suitable for hunting rifles.
• Fig. 4 : a schematic sectional view of the ring of the ball represented on the figure 3 , after impact expansion on a high-strength target, and separation of the bullet body.
• Fig. 5 : partial half-view, in partial section, of a variant of the front part of the ball of the Figure 1 , having a threaded connection between the expansion ring and the bullet body.
• Fig. 6 : a partial half-view, in partial section, of another variant of the front part of the ball of the Figure 1 , having a fretted connection between the expansion ring and the bullet body.
• Fig. 7 : a partial half-view, in partial section, of another variant of the front part of the ball of the Figure 1 , having a knurled connection in diamond points between the expansion ring and the bullet body.

As shown in Fig. 1 , the ball (1) comprises a sub-calibrated bullet (2) and a throwing shoe (3), the assembly being placed in a conventional manner in a primed sleeve (4) containing a propellant charge (5). Usually, the throwing shoe (3) consists of two identical hemi-cylindrical elements surrounding the body of the bullet (1).

The sub-calibrated ball (2) comprises a ball body (6) receiving an expansion ring (7) at its front part, and a stabilizer (8) at its rear part. The front part of the bullet body (6) comprises a revolution arrow (9). This boom (9) is integral with the bale body (6), and for example it can be manufactured by machining directly into the bale body. The rear portion of the bale body (6) comprises a fluted or threaded portion (10) for fixing the stabilizer (8). The central portion of the bale body (6) has on its outer surface grooves (11) cooperating with hinges (12) formed in the inner face of the throwing shoe (3).

The boom (9) has a diameter corresponding approximately to half the outer diameter of the bale body (6). The rear part of the boom (9) has a plurality of cylindrical spans (13) of small width, separated by narrow grooves (14). The outer diameter of the cylindrical bearing surfaces (13) is slightly greater, by a few tenths of a millimeter, than that of the cylindrical portion (15) of the boom lying in front of the bearing surfaces (13). The front part of the arrow (9) has a frustoconical shape (16).

The bullet body (6), including the arrow (9), is made of brass containing 30% of zinc, and the expansion ring is made of brass, the zinc content of which is 20% having a rigidity lower than that of the bullet body.

A bore (17) is formed inside the rear portion of the expansion ring (7). The diameter of this bore (17) is slightly smaller, by a few hundredths of a millimeter, than that of the cylindrical bearing surfaces (13) of the boom (9). The ring further comprises an annular bearing (18) slidable on the cylindrical portion (15) of the arrow (9). This bearing (18) is separated from the bore (17) by a groove (19).

A frustoconical bore (20) opening on the front face (21) of the expansion ring (7) forms, with the outer cylindrical portion (22) of the ring (7), a flattening or expansion lip (23). of small width. The small base (24) of the frustoconical bore (20) has an outer diameter at least equal to that of the bottom of the groove (19).

A groove (25) formed in the outer face of the expansion ring (7) cooperates with an adent (26) formed in the inner face of the throwing shoe (3).

The expansion ring (7) is mounted by its rear part on the arrow (9) of the bale body (6), by a force fit by cold shrinking of the bore (17) of the ring (7). on the cylindrical bearing surfaces (13) of the boom (9). The outer diameter of the cylindrical bearing surfaces (13) being very slightly greater than that of the bore (17), the establishment of the ring (7) is made in force, until its rear face (27) comes in contact against the shoulder (28) on the bullet body (6).

The circular bearing (18) of the cylindrical expansion ring (7) slides freely on the cylindrical part (15) of the arrow (9), ensuring firstly a perfect alignment of the ring (7) on the body of ball (6), and secondly an excellent coaxiality of the ring (7) on the bullet body (6).

An open cavity (29) is delimited by the face (21), the conical bore (20) and the small base (24) of the ring (7) on the one hand, and the cylindrical portions (15) and conical (16) of the arrow (9), on the other hand. The volume and the opening angle of this cavity (29) are determined according to conventional calculation methods according to the desired results, to achieve the maximum stopping power on the target.

The Figure 2 shows a partial view of the ball from the Figure 1 shot with a shotgun in a reference target (Plastiline® block), the impact velocity of the bullet being 420 m / s, and its mass of 21 g. This Figure highlights the operation of the ball, after penetration into the target and expansion of the ring.

Upon impact on the target, the expansion ring (7) exerts a punching effect on the wall of the target, making it possible to establish a hydrodynamic pressure in the open cavity (29) of the bullet (2), causing progressively deforming the expansion lip (23) outwards, thus initiating the expansion process of the ring (7) until the mechanical forces of resistance to the deformation of the ring are greater than the pressures hydrodynamic exercises.

The expanded ring (30) remains attached to the bale body (6) by the support of its rear face (27) on the shoulder (28) of the bale body (6). In this example, the projected expanded surface of the ring (7) is about 4.5 times the section of the ball in flight, and the expanded ring is perfectly circular, without appearance of cracking or radial bursting of the corolla. The boom (9), integral with the bullet body (6), allows the destruction of hard parts possibly present in the target. The impact on the target causes a slight deformation (31) of the conical portion (16) of the head of the boom (9). This deformation is of course variable depending on the shooting conditions and the properties of the target.

The annular bearing (18) ensures a deformation by regular expansion of the ring (7) by preventing misalignment with respect to the axis of the ball (2). It also ensures the maintenance of the ring from all angles of shooting, including tangential shots generating significant radial forces.

The hunting ball shown on the Figures 1 and 2 is designed to be fired specifically with shotguns with smooth or weakly scratched cannons. The stabilization of the ball on trajectory is ensured by the stabilizer (8) which ensures at best the coincidence of the geometric axis of the bullet with the tangent of the trajectory described by its center of gravity. A very slight trajectory rotation, of the order of 20 trs / s, can be imposed on this type of ball, resulting in negligible radial mechanical stresses on the components of the ball.

The Figure 3 represents an alternative embodiment of the invention applied to a bullet of the caliber of the weapon, adapted more particularly to hunting rifles.

The ball of the Figure 3 includes a gauge ball (32) having a bullet body (33) surmounted by an arrow (34) integral with the bullet body (33), and an expansion ring (35), the assembly being placed as usual in a primed metal case (36) containing an explosive powder charge (37).

The ball body (33) has at its rear part three spans (38) substantially identical and the caliber of the weapon, corresponding to the bottom diameter of the barrel of the gun, separated from each other by two decompression grooves ( 39) gases from the combustion of the powder, and a leak cone (40) conventionally designed according to the aerodynamic study of the ball.

The front portion of the bale body (33) includes an arrow (34) sub-calibrated relative to the bale body (33), and integral therewith. Three bearings (41), with the same outside diameter and decreasing height from the base to the head of the boom (34), are separated by two circular recesses (42) of substantially the same height and of a slightly smaller diameter, of a few tenths of millimeters, to that of the bearings (41). A cylindrical shoulder (43) of smaller diameter than the circular recesses (42) is placed between the bearings (41) and the conical head (44) of the arrow (34).

The expansion ring (35) comprises an axial bore (45) slidable on the three bearings (41). A longitudinal clearance (46) of about 1.5 mm is arranged beyond the third bearing towards the head of the boom (34). A functional clearance (47) of about 1 mm is provided between the bore (48) of the front of the ring (35) and the diameter (49) of the cylindrical shoulder (43) of the head of the boom. (34). The diameter of the bore (48) is smaller than that of the bore (45). A conical bore (50) opening on the front face (51) of the ring (35) forms, with the curvilinear ogive (52), an expansion lip (53).

A crimp groove (54) of trapezoidal profile is formed on the cylindrical rear portion of the ring (35) of diameter equal to that of the bearing surfaces (38) of the bullet body (33).

As shown in Figure 3 , the birth of the curvilinear warhead (52) is about 2 mm from the crimping groove (54) for crimping the bale (32) in the metal case (36).

The rear face (55) of the ring (35) comes into contact with the shoulder (56) of the bale body (33). An outer chamfer (57) of a few tenths of a millimeter is practiced on both sides of the contact plane (55, 56).

The connection between the ring (35) and the bale body (33) is ensured by friction welding on the bearings (41) and on the contact plane (55, 56). The outer chamfer (57) made on either side of the contact plane (55, 56) makes it possible to withstand any material irregularities generated by the welding.

A conical cavity (58) open at the top of the bale is delimited by the cone (50) and the front face (51) of the ring (35), and by the cone (44) of the head of the boom (34). . This cavity is extended in a circular manner by the games (47) and (46) arranged between the bores (48) and (45) of the ring (35) and the cylindrical shoulder (43) of the arrow (34).

The metallic materials used in this embodiment of the invention are the same as in the previous example.

The operation of this target ball is similar to that of the sub-calibrated ball of the Figure 1 , the deformations being similar to those of the Figure 2 .

However, the target impact speeds are higher, and can then cause the ring (59) to separate as shown in FIG. Figure 4 . The ring can then slide on the bullet body (33) which exerts its effect of penetration into the target. The expanded ring (59), the bullet body (33) and its arrow (34), however, remain in alignment along the axis of the bullet, even after separation of the ring (59). This result is favorable to ball shooting safety and the protection of the environment.

The volume of the open cavity (58) is determined according to the conventional calculation techniques as a function of the mass of the bullet, its impact velocity, as well as the effects sought on the target.

The Figure 5 represents an alternative embodiment of the ball of the Figure 1 , wherein the ring (60) is fixed to the arrow (61) integral with the bale body (62) by means of a thread (63). The thread is machined to ensure perfect locking of the ring (60) of the contact plane (64) between the rear face (65) of the ring (60) and the shoulder (66) provided in the bullet body (62).

The front face (67) of the arrow (61) and the front face (68) of the ring (60) are located in the same plane.

The Figure 6 represents another variant of expansion ring (69) mounted on the boom (70) of the bullet body (71) of a sub-calibrated bullet.

The front part of the boom (70) comprises a cone (72) whose front face (73) is projecting from the front face (74) of the ring (69). The contact surface (75) between ring and arrow is smooth, the setting of the ring (69) on the arrow (70) being carried out hot, the bullet body having been previously cooled at low temperature, for example in liquid nitrogen. A frettage tightening is then created.

The diameter of the bore of the ring (69) to the right of the link (75) and the diameter of the arrow (70) to the right of the same link are determined beforehand by calculation to obtain an optimal binding without deformation of the ring (69).

The Figure 7 represents another alternative embodiment adapted to a sub-calibrated bullet, wherein the ring (76) is assembled to the arrow (77) of the bullet body (78) by means of a spike-shaped relief machining (80). diamond, on the back of the arrow (77). The internal bore (79) at the rear of the ring (76) is smooth and has a diameter smaller than the outside diameter of the raised machining (80) of the boom (77).

The assembly of the ring (76) on the boom (77) is carried out by force introduction of the ring on the machining (80) until it abuts on the shoulder (81) of the bullet body (78). ).

The front face (82) of the arrow (77) is set back relative to the front face (83) of the ring (76).

The invention can be applied to ball ammunition for all weapons, and more particularly to hunting weapons of all calibers, with a smooth or striped barrel.

Claims (13)

1. A round for small, medium and large caliber guns, consisting of a full-caliber or subcaliber bullet (2), of the type comprising a substantially rigid bullet body (6) and a deformable part, characterized in that the deformable part consists of an approximately cylindrical expansion ring (7), the rear part of which is fitted onto the front part of the bullet body (6).
2. The round as claimed in claim 1, characterized in that the expansion ring (7) includes, on its front face (21), an emergent frustoconical bore (20), which cooperates with the front face of the head of the bullet body (6) in order to form an open cavity (29).
3. The round as claimed in claim 2, characterized in that the emergent frustoconical bore (20) on the front face (21) of the expansion ring (7) forms, with the external cylindrical part (22) of the ring, a narrow expansion flat or lip (23).
4. The round as claimed in any one of claims 1 to 3, characterized in that the rear part of the ring (7) comprises a stop (27) that bears against a shoulder (28) on the bullet body (6).
5. The round as claimed in any one of claims 1 to 4, characterized in that the base of the emergent frustoconical bore (20) comprises an annular bearing surface (18) that bears against the cylindrical surface (15) of the head of the bullet body and is capable of sliding over said cylindrical surface (15).
6. The round as claimed in claim 5, characterized in that the annular bearing surface (18) is separated from the rear part of the cylindrical ring by an annular groove (19).
7. The round as claimed in any one of the preceding claims, characterized in that the outer surface of the cylindrical ring is slightly conical.
8. The round as claimed in claim 7, characterized in that the outer surface of the cylindrical ring has a curvilinear ogival shape (52).
9. The round as claimed in claim 1, characterized in that the front face of the expansion ring lies substantially in the plane of the face of the head of the bullet body.
10. The round as claimed in claim 1, characterized in that the front face of the expansion ring is protruding from the head of the bullet body.
11. The round as claimed in claim 1, characterized in that the front face of the expansion ring is set back relative to the plane of the head of the bullet body.
12. The round as claimed in any one of the preceding claims, characterized in that the expansion ring is fitted onto the bullet body by screwing, friction welding, shrink-fitting or force-fitting.
13. The round as claimed in claim 12, characterized in that the ring is force-fitted onto the bullet body by means of a diamond-shaped knurled contact surface.

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