RU2814053C1 - Method of accelerating bullets and multi-section multi-bullet unitary shot for its implementation - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: group of inventions relates to a method of accelerating bullets and a multi-section, multi-bullet unitary shot for its implementation. To accelerate the bullets in the barrel of the artillery or small arms, the bullets are placed in the cartridge case of a unitary shot and accelerated with the help of gunpowder. Combustion of powders is initiated by two primers-igniters, one of which is placed on the bottom of the cartridge case of a unitary shot, made multisectional conical, and the other one is pressed into the rear of one external bullet from three bullets: an internal bullet, a tail-finned intermediate bullet and an external bullet, placed inside the case alternately, coaxially, in contact with each other. Inner bullet is pressed into inside rolling groove, which is made in hot sleeve with formation of two isolated sections inside sleeve, which are filled with gunpowder. In the end of the internal bullet, the tail-finned part of the fledged intermediate bullet is pinched, at the center of mass containing the empennage. Tip of the tail-finned intermediate bullet is fixed with fusible material at the center of the primer of the external bullet. External bullet is inserted into the cylindrical barrel molded on the end of the case and squeezed in it. Combustion fronts are directed towards each other, and after they have built up the forcing pressure, they are directed to the three bullets sequentially clamped inside the cartridge. By means of forcing pressure the above bullets in the barrel are accelerated by one shot one after another. Also disclosed is a multi-section multi-bullet unitary shot device.

EFFECT: providing the creation of high pressure in the case and the barrel channel and its retention for a relatively long time for acceleration with one shot of several ammunition, including tail-finned ammunition, in order to increase their range, accuracy and armor penetration.

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Description

The proposed technical solution relates to ammunition for small arms and artillery weapons, in particular to machine guns, carbines, sniper rifles, heavy machine guns, small-caliber guns and artillery gun systems that use unitary projectiles and cartridges with multiple ammunition to destroy enemy personnel and armored combat vehicles.

An analogue to the proposed technical solution can be a rifle with a conical barrel and a Hermann Gerlich bullet: (https://ru.wikipedia.org/wiki/Gerlich, Herman)

The design of the system, bullet - barrel is as follows: behind the bullet entrance there is a rifled cylindrical part of the barrel, followed by a rifled conical part. The extreme muzzle part of the barrel is cylindrical.

The rifle bullet had a sharp tip, a flat bottom and two thickened bands. The initial speed of a bullet fired from Hermann Gerlich's rifle was (1600-1700) m/s. A conical barrel was used to increase the initial speed of the bullet (projectile). At the beginning of the bullet's movement, the pressure of the powder gases acts on a large area of its bottom. When a bullet moves along a conical barrel, the pressure of the powder gases begins to drop, but this drop is compensated by a decrease in the volume of the barrel compared to a conventional, cylindrical one. At the same time, the area of the projectile decreases, but when the leading belts of the bullet are compressed in the barrel, a high degree of obturation of the powder gases is maintained, reducing their losses.

This analogue partially solves the problem of increasing the pressure of powder gases as the bullet moves along the barrel, by obtaining additional pressure from reducing the volume of the bullet space of the bullet moving in the conical barrel. The technological complexity of manufacturing rifled conical barrels is a significant factor that has not allowed Gerlich Hermann’s technical solution to be put into practice until now. The bullet itself is made with two thickened copper belts, the indentation of which, when moving in the bore of the cylindrical barrel, slowed down the bullet and increased the pressure in the barrel and the burning time of the gunpowder, and also caused increased wear of its cylindrical part. However, the system proposed by Gerlich Hermann: a cylindrical rifled barrel - a bullet, made it possible to obtain, by changing the cross-section of the barrel, additional pressure and significantly increased the speed of the bullet leaving the barrel.

An analogue to the proposed technical solution “Method of extensive acceleration of bullets and projectiles and a multi-sectional, multi-bullet unitary cartridge for its implementation” can serve as a German multi-chamber (multi-section) gun from the 2nd World War “LRK 15 F58” https://makulaturoman.livejoumal .com/5524.html

The analogue is done as follows. The basis of the design of the multi-chamber gun was the barrel and accelerating chambers (sections). It was a structure of 32 elements. All elements were assembled in a concrete shaft, the finished shaft was installed at a calculated elevation angle of 55 degrees. The main difference from standard guns, which use a single charge in the barrel for acceleration, the multi-chamber gun used a method of multi-stage shot acceleration. It consisted of the following: through calculated equal sections of a very long barrel, additional chambers were made to accommodate charges. They were performed at an obtuse angle to the muzzle of the barrel. The projectile was placed in the breech of the gun and the initial movement was imparted to it by a powder charge placed in the breech. To a projectile moving along the barrel, detonations of charges in the chambers imparted additional speed. The initiation of additional powder charges was carried out using electric detonators. As a result, the projectile left the barrel at a speed of 1500 m/sec.

Due to the absence of rifling in the bore, stabilization of the flight of the projectile of a multi-chamber gun was ensured by the tail of the projectile. The tail, in the form of 4-6 folding stabilizers, was supposed to open after the gun exited the bore from the actuation of the springs.

Specially designed high-speed projectiles flying out of the barrel did not acquire the required stabilization in flight from abnormal operation of the stabilizers. When setting a fixed elevation angle and direction, the introduced correction for the rotation of the Earth's rotation became irrelevant. The bulky design of the multi-section gun, the long barrel, and the long deployment time of the practically stationary device did not allow it to find wide application. In the channel and chambers of the gun barrel, conditions were not created for a short-term increase in the pressure of the powder gases and the necessary “slowing down” of the powder gases by the ejected ammunition, which was somehow accomplished in the conical barrel of the Herlich Hermann rifle.

The prototype for the proposed technical solution is a development protected by RF patent No. 2251067 in which it is proposed to place inside a channel made in a 14.5 mm caliber bullet, 2 standard bullets of 7.62 mm caliber or, in an extended version of a 14.5 mm caliber bullet, three or more bullets of lower mass. As a result of the activation of the combustion retardant, which initiates the expelling charge, at a distance of (1000-1200) m, a 14.5 mm caliber bullet releases internal bullets from itself, while it itself expands, allowing the internal bullets pressed into it to fly out and slows down, along with a pallet in which the moderator and expelling powder charge were placed. At the same time, the authors count on the sub-caliber effect of acceleration of internal bullets due to the rejection of the excess mass of the mother bullet by the incoming air, which, by the time the built-in bullets are fired from it, has lost at least 40% of its initial speed. Lengthening the mother bullet, in order to equip it with a large number of built-in bullets, will lead to increased friction against the walls of the rifled weapon barrel and its overheating, which can lead to a change in the properties of the moderator, with possible abnormal ignition of the expelling charge and the melting of the lead rings, inside of which the steel ring is placed mini mother bullet barrel. The main part of the powder gases of the expelling charge will work to throw the pan back and expand the side surfaces of the mother bullet. The area of influence of the propellant gases of the expelling charge on the internal bullets will be limited by the projection area of the first bullet and then, through hard contact, onto the second and third, a mini-barrel with side rifling pressed into the guide bushing, surrounded by lead rings. A small-volume expelling charge placed at the base of a mini-barrel is not capable of imparting any significant speed to a group of bullets. It is problematic to place more than two internal standard bullets in the mother bullet without compromising ballistics. It is possible to mount a larger number of bullets only by reducing their mass, which will also affect the range of their destructive action. The technical solution of the prototype multi-charge bullet does not allow the bullets to be given increased speed and fired simultaneously with conventional and feathered ammunition.

The objective of the proposed technical solution: “A method for extensive acceleration of bullets and projectiles and a device for a multi-section and multi-bullet unitary shot for its implementation” is to create high pressure in a multi-section multi-bullet case and bore and hold it for a relatively long time, during which gunpowder, in comparison with analogs, does a lot of work, with the release of additional energy, to accelerate several ammunition, including feathered ones, with one shot, to high speeds in order to increase: range, accuracy and armor penetration of existing weapons after its modernization.

The stated technical problem “Method of extensive acceleration of bullets and projectiles...” is solved by manufacturing a special multi-sectional, multi-bullet cartridge case, in the sections of which powder charges are placed, separated by bullets and equipped with two detonator capsules, counter-propelled, initiating powder charges and combustion fronts of the propellant The explosives are directed towards each other, thereby increasing the pressure and burning time of the gunpowder, due to its braking by a tandem of bullets, the initial impulse and cutting into the rifling, three or five bullets, which are placed between sections in a multi-section sleeve.

The stated technical problem “...Design of a multi-section, multi-bullet shot and a unitary cartridge for its implementation” is solved by reducing the bullet volume of gunpowder combustion in the “before the bullet space” of the internal bullet, by creating an internal bullet, a movable combustion chamber, which is limited by the barrel, head and internal bullet. At the same time, the internal bullet is moved by the powder charge with emphasis on the bottom of the multi-chamber case and the weapon. The head bullet is moved by a charge of gunpowder based on the internal bullet, which has already begun to move, and begins to reduce the volume of the bullet space - the accelerating head bullet. The total, short-term separated pressure of the burning powder gases of both chambers, both bullets, is transferred to the bottom of the multi-chamber cartridge case and to the weapon. In the initial period of the shot, the movement of the combustion front of the gunpowder from the bottom of the cartridge case and the combustion front from the head bullet, jamming of the gunpowder is prevented by an intermediate feathered bullet, the tip of which initiates a detonator cap installed in the bottom of the head bullet, the initiation of which, with the ignition of gunpowder in the behind-the-bullet space of the head bullets, occurs after the tandem of bullets, consisting of an internal and feathered bullet, moves at a distance of no more than 0.5 mm.

In the proposed technical solution of the method and device, the slowdown in the burning time of the gunpowder and the high pressure are caused not by a conical barrel and a bullet with thickened bands, as in the analogue of the Gerlich Hermann system, but by short-term braking and counteraction to each other by the expanding combustion gases of the powder charges in the first and second sections cartridge cases, the moment of inertia of three bullets accelerating simultaneously, cutting into rifling, friction and spin of three bullets on the bore. In the attached technical solution: “Method of extensive acceleration of bullets and projectiles and the design of a multi-section and multi-bullet unitary cartridge for its implementation,” there is no loss of gas obturation when the internal bullet moves through the rifling of the weapon barrel. Powder gases that break through the rifling of the internal bullet increase the pressure between the internal and the head bullet (projectile). When the head bullet leaves the barrel, the obturation gases accelerate the intermediate feathered bullet.

In fig. Figure 1 shows a multi-section, multi-bullet cartridge and section A-A, with a variant of the cross-section of the intermediate feathered bullet, in the place of surfacing (spraying) to the tips and planes of steel or tungsten wings of an elongated tail, coated with light metal.

In FIG. 2 shows the stages of the sequential release of bullets from a single shot from a weapon. Stage I. The position of the multi-chamber cartridge case in the barrel chamber before firing.

Stage II. Sequential ignition of gunpowder in the 2nd (7.2) then in the 1st (7.1) chamber. Start of movement: 3.2 LSP bullets, which tows an OPP 5 bullet, and 3.1 LSP bullets

Stage III. LSP 3.1 bullet, OPP 5 bullet and LSP 3.2 bullet in the barrel. There is intense combustion of gunpowder in the bore and cartridge case. The LSP 3.2 bullet tows and partially spins the OPP 5 bullet due to contact with the radial notches 13 and copper-plated ends 11, elongated wings 10.

Stage IV. The towed bullet OPP 5, untwisted and accelerated in the first half of the barrel by the towing bullet 3.2, at the moment the bullet 3.1 takes off, continues to accelerate from the excess pressure of the powder gases of the obturation and is disconnected from the bullet 3.2

V stage. The towed Bullet OPP 5 flies beyond the muzzle of the barrel and continues to accelerate due to the excess pressure of the powder gases, obturation and loss of bullet mass 3.2

In FIG. 3 shows the pressure curve in the barrel bore at the moment of firing from a conventional weapon with a conventional cartridge. In FIG. 4, - pressure curve from a shot from a modernized weapon with a multi-sectional multi-bullet unitary cartridge modernized under a multi-sectional multi-bullet unitary cartridge.

The proposed device for a multi-section, multi-bullet shot consists of a conical steel varnished or copper case 1, in which, during manufacturing, it is hot formed behind the rolling groove 2, with a diameter that allows internal bullets or shells 3.2 to be pressed inside behind the rolled part of the steel case, into at the bottom of which, according to known technology, a capsule 4.2 is installed (Fig. 1) Inside the sleeve 1, three bullets are placed alternately, coaxially, in contact with each other: an internal bullet (LPS) 3.2, an intermediate feathered bullet 5 (OPP), the end, feathered part mounted on bullet 3.2, and the tip of the intermediate bullet 5 (OPP) is fixed in the center of the igniter primer 4.1 with a durable, flammable, low-melting material 6, with a design gap of no more than 0.5 mm. from the contact plane of the 4.1 primer, pressed into the rear of the outer LPS 4.1 bullet. For rolling 2, with a 4.2 bullet, it separates the multi-section sleeve 1 into sections 7.2 and section 7.1. For the rolling groove 2, on the multi-chamber sleeve 1, during the hot manufacturing process, outside, flush with the surface of the sleeve, it is filled with light metal 9. Feathered bullet 5 (OPP), at the center of mass contains an elongated steel tail 10, on the tip of the wings of which, a soft metal coating is applied 11. The tail 12 of the OPP 5 bullet is made to copy the tip of the LPS bullet and in its rear part, in the center, a conical recess with radial notches 13 is selected, into which the tip of the LSP 3.2 bullet is inserted, with the possibility of spinning the OPP bullet 5, the aversion of the bullet 3.2, in the rifling of the bore 14, during their joint accelerated acceleration and subsequent detachment, due to heating by powder gases, friction inside the bore and further, after the departure of the bullet 3.1, the actions obturating through the rifling between the bullet 3.2 and the barrel, powder gases, into the bullet space of the OPP 5 bullet. At the tip of the conical, multi-bullet case 1, a cylindrical barrel 8 is molded, with a diameter that allows the inner bullet 3.2 to enter the case, after which the outer bullet 3.1 is compressed into it. In the proposed device, there is a multi-sectional bullet sleeve 1, from rolling the transition slope in the volume of section 7.1, for fixing behind it, in the elongated cylindrical part of the copper-plated tail 11, a bullet 5 is not provided. The stable position of the feathered bullet 5, inside the cartridge case before the shot, is ensured not by contact of the wings with the cartridge case, but by its coaxial pinching between the tip of the bullet 3.2 and its strong fixation to the center of the capsule sleeve 4.1. fusible, durable, combustible compound 6. The entire surface of the sleeve 1 is conical and ends with a cylindrical barrel 8, for pressing bullets into it 3.1. This design of the multi-bullet multi-section sleeve 1 allows the rotary feeder of the cartridge manufacturing line to speed up the time of equipping section 7.1, with an intermediate feathered bullet 5 installed in it, a weight of gunpowder, reduce the production time of the sleeve, reduce the number of operations for its manufacture, and strengthen the body of the sleeve against tearing and reduce the effort to remove the cartridge case from the chamber.

The operation of powder gases when firing from a weapon modernized for a multi-bullet, multi-section unitary shot is shown in stages in Fig. 2 and happens as follows. Under the influence of the trigger mechanism of the weapon, the primer igniter 4.2 is activated, which causes the ignition of gunpowder in chamber 7.2 (Fig. 2, stage I). The expansion of gases causes the initial movement of the internal bullet 3.2, which, having advanced no more than 0.5 mm, through the steel rod of the feathered bullet 5 initiates the capsule 4.1, which is ignited by the bullet powder charge 7.1. The initiation of gunpowder combustion by primers 4.1 and 4.2 in sections 7.1 and 7.2 generate counter waves of gunpowder combustion, the total effect of which increases the pressure in the cartridge case and increases its reaction time to the movement of ammunition along the barrel, and therefore the burning time of the gunpowder. Briefly separated combustion of gunpowder in chamber 7.2 and section 7.1 moves the outer bullet 3.1 into the rifling or into the smooth barrel of the weapon. (Fig. 2, stage II) Feathered bullet 5, at the initial moment of burning of gunpowder in chamber 7.2, prevents jamming of gunpowder by the internal bullet 3.2 in section 7.1, transferring the pressure of the gunpowder that has begun to burn to bullet 3.1, moving it into the rifling of the barrel. The blunted tip of the feathered bullet rod 5 crushes the spent primer 4.1, providing “soft” contact of two bullets, feathered 5 and conventional 3.1 prevent elastic axial deformation of the feathered bullet rod 5, at the initial moment there is a lot of bullet shot. In this case, hot gases from section 7.2, through a temporarily formed annular gap, between the internal bullet 3.2 and the cartridge case 1 penetrate into section 7.1 and ignite the gunpowder at the base of section 7.1. Fig. 1. Under the 3.1 bullet, in section 7.1, the gunpowder is already ignited by the 4.1 primer. The combustion of gunpowder in section 7.1 slows down the movement of the internal bullet 3.2 and the feathered bullet 5 aligned coaxially with it and accelerates the movement of the bullet 3.1. At the same time, the burning of the priming powder charge of the head bullet 3.1 in section 7.1 occurs under conditions of a slow increase in volume, from the moving bullet 3.2 propped up behind it, behind which the powder charge of section 7.2 continues to burn. (Fig. 2. Stage III) This causes an increased in comparison with analogues, the pressure of powder gases on the walls of the barrel, the bottom of the outer bullet 3.1 and the head of the inner bullet 3.2. In the proposed invention of the method and device, the increased, in comparison with analogues, pressure of the burning gunpowder and the relatively long time of its burning, contributes to the extraction of additional pressure from the propellant explosive. (Fig. 3, Fig. 4). The burning of gunpowder behind the LPS 3.2 bullets and the feathered bullet 5 (OPP) temporarily, coaxially docked to it using a conical recess with radial notches 14, until the exit of the outer bullet 3.1, occurs in the slowly expanding volume of the barrel 14 in a multi-bullet case 1. Departure external bullet 3.1 and the subsequent release of pressure in the barrel bore in front of the intermediate feathered bullet 5 and bullet 3.2 moving in it, due to the greater resistance of the three bullets to movement along the barrel bore and the increased pressure behind them, initiates dynamic acceleration and spinning of the feathered bullet 5, towed , internal bullet 3.2, followed by a high initial speed of departure of both separated bullets, Fig. 1. The internal bullet 3.2 temporarily tows the feathered bullet 5 in front of itself, which by the time it leaves the barrel 14, due to the rotation of the bullet 3.2 and its contact with the radial notches 13, spins up and acquires the required speed, followed by separation from the internal bullet 3.2. The separation of bullets 3.2 and 5 in the second half of the bore 14 is facilitated by the flight of the outer bullet 3.1, the resulting obturation of the pelvis between the rifling of the barrel and the inner bullet 3.2 and the lower drag of the intermediate bullet OPP 5. (Fig. 2, stage IV). During the accelerated acceleration of the intermediate towed bullet OPP 5, the copper-plated coating 11, extending beyond the empennage 10, protects the barrel 14 from wear (Fig. 2, stage IV). A significant difference in the proposed technical solution of the method and device is the absence of 5 sectors-pallets in the feathered bullet for its acceleration in the barrel, which prevent the flow of powder gases between bullets 3.1 and 3.2. To prevent nutation from the impact of sector-pallets, the author proposed to abandon them and accelerate the feathered bullet OPP5, by towing it inside the bore with an internal bullet 3.2, a lot of bullet shot. After leaving the barrel, the feathered bullet 5 experiences less impact from oncoming air and moves away from the barrel of the weapon at a higher speed than the bullet 3.2. Due to the rejection (detachment) of the excess mass of the internal bullet 3.2 (pushing bullet), the initial speed of departure of the feathered bullet 5 acquires additional acceleration. (Fig. 2, stage V). As a result of the work of the total combustion energy of the gunpowder, increased, in comparison with the usual one, from the barrel of the weapon, in a short period of time, with one shot formed by the combustion of gunpowder in briefly separated sections 7.2 and 7.1 and in the barrel bore 14, three bullets fly out in turn: one outer bullet 3.1, one intermediate, feathered bullet 5 and one internal bullet 3.2. In the case of manufacturing three sections in a multi-section unitary case, the number of simultaneously ejected bullets or shells will increase to five. Based on the results of R&D experimental design work and subsequent tests of different options for manufacturing the volumes of powder chambers 7.2, 7.1, different masses of bullets 3.1, 3.2 and 5, different frontal sections of feathered and conventional bullets (shells), as well as the correct selection of existing gunpowders, possibly on one from cartridge factories of the Russian Federation, to produce the final version of the invention proposed in this technical solution: “Method of extensive acceleration of bullets and projectiles and the device of a multi-sectional, multi-unit bullet shot for its implementation.” To use the proposed invention, it is necessary to modernize existing military weapons in terms of: increasing the length and shape of the chamber, the size of the magazine, the cartridge acceptance window and increasing the length of the receiver. In FIG. 3 shows the pressure curve in the barrel bore at the moment of firing from a conventional weapon, with a conventional cartridge. In FIG. 4, pressure curve from a shot from a modernized weapon with a multi-sectional multi-bullet unitary cartridge. In the second curve of Fig. 4, the length of the high-pressure wave section will increase and take longer compared to the curve of a conventional shot. Fig. 3. The most popular and promising area of application of a multi-section multi-bullet shot is in counter-sniping.

The technical effect of the application of the invention given in the description, graphics and claims: “Method of extensive acceleration of bullets and projectiles and the device of a multi-sectional, multi-bullet unitary shot for its implementation,” in practice will increase the density, accuracy and range of fire of the existing modernized small-caliber and small-caliber artillery weapons, at least twice. It will make it easier to carry a supply of cartridges and shells, and will allow, in a short period of time, with one shot, to fire three or five bullets (shells) flying at high speed and over a longer distance at once. Due to the shorter time spent by personnel in the enemy's field of view during combat and shooting using a multi-bullet shot, it will save the lives of the soldiers of our army. It will allow you to reliably, with one shot, hit the enemy at a fairly large distance in counter-sniping.

The economic effect of the invention given in the description, graphics and claims: “Method of extensive acceleration of bullets and projectiles and the device of a multi-sectional, multi-bullet unitary shot for its implementation” will save metal, gunpowder, primer - igniters and labor costs for the production of one unitary shot instead of three or five . Will allow you to reduce the cost of treating a wounded horse during a rifle, artillery and tank battle.

In monetary terms, if the production of unitary multi-sectional rounds and modernized weapons for their use begins, the economic effect could amount to billions of rubles.

Claims (10)

1. A method for accelerating bullets, including accelerating bullets in the bore of artillery or small arms weapons, which are placed in the case of a unitary shot and accelerated using gunpowder, characterized in that the combustion of gunpowder is initiated by two igniter capsules, one of which is placed on the bottom of a unitary shot cartridge case, made of multi-section conical, and the other is pressed into the rear of one outer bullet of three bullets: an internal bullet, a feathered intermediate bullet and an external bullet, placed inside the cartridge case alternately, coaxially , in contact with each other, while the inner bullet is pressed inside the internally rolled groove, which is made hot in the case, forming two isolated sections inside the case, which are filled with gunpowder, the tail feathered part of the feathered intermediate bullet is pinched to the tip of the inner bullet, the feathered intermediate bullet contains feathering at the center of mass, and the tip of the feathered intermediate bullet is fixed with a low-melting material in the center of the igniter primer of the outer bullet, and the outer bullet is inserted into a cylindrical barrel molded at the end of the cartridge case and compressed into it, in this case, the combustion fronts are directed towards each other and, after they have gained boost pressure, they are directed at three specified bullets sequentially clamped inside the cartridge case, in this case, using boost pressure, the specified bullets in the barrel are accelerated in one shot, one after another. 2. The method according to claim 1, characterized in that the outer recess of the rolling groove formed on the sleeve from the outside is hot filled with metal flush with the conical surface of the sleeve. 3. The method according to claim 1, characterized in that in the tail feathered part of the feathered intermediate bullet a conical recess with radial notches is made, copying the tip of the internal bullet. 4. The method according to claim 1, characterized in that the tip of the feathered intermediate bullet is fixed with a low-melting material in the center of the igniter primer of the outer bullet with a gap of no more than 0.5 mm from the contact plane of the igniter primer. 5. The method according to claim 1, characterized in that the feathered intermediate bullet at the center of mass contains feathering in the form of copper-plated steel wings. 6. A device for a multi-sectional multi-bullet unitary shot, including a cartridge case, a propellant in the form of gunpowder, bullets arranged in series, characterized in that the cartridge case is made multi-sectional conical with an igniter primer at its bottom, placed alternately inside the cartridge case, coaxially, in contact with each other three bullets: an internal bullet, a feathered intermediate bullet and an external bullet with an igniter primer pressed into its rear, the internal bullet is pressed inside a rolling groove rolled into the inside, which is made hot in the case, forming two isolated sections inside the case, which are filled with gunpowder, to the tip of the inner the tail feathered part of the feathered intermediate bullet is pinched, the feathered intermediate bullet contains feathering at the center of mass, and the tip of the feathered intermediate bullet is fixed with a low-melting material in the center of the igniter primer of the outer bullet, the outer bullet is inserted and compressed into a cylindrical barrel molded at the tip of the cartridge case. 7. The device according to claim 6, characterized in that the outer recess of the rolling groove formed on the sleeve from the outside is hot filled with metal flush with the conical surface of the sleeve.

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