CARTRIDGE OF A FIREARM, CARTRIDGE HOLDER, COMBINATION OF LOCK AND CARTRIDGE HOLDER OF SUCH A FIREARM

Description

[0001] The invention relates to a cartridge for a firearm, a cartridge chamber, a combination of breech and cartridge chamber of such a firearm, and a firearm, in detail according to the independent claims.

[0002] According to the invention, a new cartridge, specifically an intermediate cartridge or, in particular, a rimless rifle cartridge with centerfire ignition, is designed and optimized specifically for small arms and support weapons used in military and police operations in urban environments and for the use of subsonic and supersonic ammunition. Intermediate cartridges have dimensions intermediate between pistol and rifle cartridges, enabling controlled single and fully automatic fire with sufficient range and muzzle energy from small arms. The engineering and design aimed to achieve the maximum possible internal and external ballistic performance parameters.

[0003] One of the best-known, most reliable, and proven designs for urban combat is the 7.62 mm x 39 (M43) cartridge and its associated small arms systems. Among the most well-known small arms systems that fire this cartridge is the Kalashnikov 47 (AK-47) assault rifle. A cartridge optimized for the M16 / AR15 platform is disclosed in US patent 2019 / 204051 A1.

[0004] The AK-47 system in 7.62 mm x 39 (M43) caliber has posed the greatest threat to Western states and NATO for over 75 years. Reasons for this include its global prevalence, low procurement costs, and the relatively small size and light weight of both the weapon system and the cartridge, resulting in comparatively low gunfire. The effectiveness of this cartridge is considered sufficient for the aforementioned operational scenarios. The 7.62 mm x 39 (M43) cartridge is a design introduced in the USSR in 1943, which was developed in Germany in the 1930s (by Genschow / Karlsruhe-Berlin) for the Vollmer M35 assault rifle system in Biberach.

[0005] Military small arms in 7.62 mm x 51 caliber can also fire subsonic and supersonic projectiles. However, due to their significantly heavier weight and ammunition, they are only suitable as support weapons in highly dynamic operational tactics.

[0006] Compared to weapon systems for short cartridges (e.g., AK-47), the longer bolt travel times (duration of automatic reloading) combined with the increased shooter fatigue due to the more pronounced recoil make rapid and accurate follow-up shots more difficult. Ultimately, the internal case volume of the 7.62 mm x 51 caliber, due to its relatively large cartridge case, is not optimally designed for subsonic ammunition, which can lead to mechanical problems and a loss of accuracy.

[0007] The object of the present invention is therefore to provide a cartridge for a firearm that is capable of closing the capability gap, particularly for operations in urban environments, between the known 7.62 mm x 39 (M43) and 7.62 mm x 51 cartridges based on an intermediate cartridge. This would enable superior performance in the supersonic range compared to all similar cartridges relevant to military and law enforcement (such as the 5.56 mm x 45 and 7.62 mm x 35 cartridges) under otherwise identical conditions at typical combat ranges in urban environments. In particular, the invention aims to provide a chamber, a combination of breech and chamber of such a chamber, and a firearm capable of firing the cartridge according to the invention while also ensuring one-sided backward compatibility with cartridges in caliber 7.62 mm x 39 (M43).

[0008] The (length) specifications according to the present invention are given in millimeters [mm] and in brackets in inches ["].

[0009] The problem is solved by a cartridge according to claim 1 and a cartridge chamber according to claim 9. The aforementioned ratio is therefore a quotient of the bullet diameter (G1) and the case neck length (L3-L2).

[0010] The case neck length is calculated as the difference between the value L3 (total length of the cartridge case) and the value L2 (length of the case to the shoulder-neck junction).

[0011] The length of the case neck, i.e. the case neck length (L3-L2), can be between 5.81 mm (0.2287") and 6.61 mm (0.2602").

[0012] The mean maximum permissible gas pressure (Pmax) for the Commission Internationale Permanente (CIP) is set at up to 4400 bar (638,176 psi), which represents the maximum value according to CIP. The mean maximum permissible gas pressure (Pmax) for the Sporting Arms and Ammunition Manufacturer's Institute (SAAMI) is set at 5515 bar (80,000 psi). These high gas pressures result in a significant increase in ballistic performance and thermal efficiency compared to existing intermediate cartridges.

[0013] The cartridge according to the invention can be a rimless rifle cartridge with centerfire ignition. It comprises a case base with an extractor groove, a case body adjoining it, the case body transitioning via a shoulder cone into a case neck that receives the projectile.

[0014] When, according to the invention, reference is made to dimensions such as L1, L2, L3, G1 of the cartridge or the chamber, etc., or to known cartridges, then these dimensions, measurements, tolerances, test runs, and terms used are understood to conform to the established rules of the aforementioned Permanent International Commission for the Testing of Small Arms (CIP). The angle of the shoulder cone is specified according to the present invention as a half-angle, as is customary at the Sporting Arms and Ammunition Manufacturer's Institute (SAAMI). In the figures ( Fig. 5 and Fig. 6 ) the angle of the shoulder cone is mapped according to CIP.

[0015] The cartridge according to the invention can thereby be: These cartridges are designed to be fired from compact military handguns and support weapons with relatively short barrels without excessive power loss and with minimal wear on the weapon system. They should be superior to comparable intermediate cartridges, such as the 7.62 mm x 35 and 7.62 mm x 39 (M43), in ballistic effectiveness (precision, range, and energy transfer). They should be suitable for firing the heaviest projectiles of the caliber group at subsonic speeds and, in conjunction with a suppressor, contribute to a significantly lower unmasking factor. Due to the special geometry of the chamber, it can be designed to also fire 7.62 mm x 39 (M43) cartridges (backward compatibility). The optimized design of the projectile transition allows for comparatively above-average precision.The geometry of the cartridge according to the invention must be designed such that it cannot be fired from weapon systems in caliber 7.62 mm x 39 (M43) (one-sided backward compatibility).

[0016] Preferably, the cartridge length L6 is between 55.00 mm (2.165") and 57.00 mm (2.244"), more preferably between 55.70 mm (2.1929") and 56.30 mm (2.2165"), and particularly preferably 56.00 mm (2.2047"). The chamber according to the invention ensures that cartridges in caliber 7.62 mm x 39 (M43) can be fired with above-average precision in addition to the cartridge according to the invention and the projectiles. This high precision capability is achieved by a projectile transition of the chamber designed according to current standards for optimal precision.

[0017] Advantageously, the diameter of the projectile is between 7.85 mm (0.309") and 7.92 mm (0.312"), preferably exactly 7.92 mm (0.312"), and preferably the diameter (H1) of the case neck is 8.60 mm (0.3386").

[0018] Preferably the length (L2) from the base to the transition shoulder cone-sleeve neck can be between 31.69 mm (1.2476") and 33.89 mm (1.3343"), preferably between 32.29 mm (1.2713") and 33.29 mm (1.3106"), and particularly preferably 32.79 mm (1.2909").

[0019] Preferably, a shoulder cone can be attached to the neck of the cartridge case, which in turn transitions into a body of the cartridge case, wherein the body of the cartridge case connects to an extractor groove of the cartridge at the base of the case and is preferably designed to taper conically from the extractor groove to the shoulder cone, such that the body of the cartridge case has a diameter (P1) of 11.35 mm (0.4469") following the extractor groove and a diameter (P2) of between 10.07 mm (0.3965") and 11.350 mm (0.4469") following the shoulder cone, preferably between 10.45 mm (0.4114") and 11.00 mm (0.4331"), particularly preferably 10.773 mm (0.4241").

[0020] This feature also achieves one-sided backward compatibility with the 7.62 mm x 39 (M43) cartridge. This allows such a cartridge to also be fired in a cartridge chamber designed for the cartridge according to the invention or in a firearm comprising such a cartridge chamber.

[0021] The preferred diameter P2 of 10.773 mm (0.4241") results in a case volume approximately 7% larger than that of the 7.62 mm x 39 (M43) cartridge.

[0022] The cartridge has a primer chamber. Preferably, this is a Boxer centerfire or Berdan centerfire primer.

[0023] According to one embodiment of the cartridge, a radius of 1.50 mm (0.0591") can be provided at the transition from the case body to the shoulder cone (r1 min) and a radius (r2) of 1.50 mm (0.0591") can be provided at the transition from the shoulder cone to the case neck.

[0024] The shoulder cone can be tapered conically towards the sleeve neck and has a half-angle of 20° to 42.5°, preferably between 20° and 30°, particularly preferably 25°.

[0025] The present invention also relates to a cartridge chamber of a firearm, wherein the cartridge chamber has a cartridge space comprising a case neck to which a shoulder cone is attached, which in turn transitions into the case body, wherein the cartridge chamber is designed in such a complementary manner as to accommodate the cartridge according to the invention as well as the 7.62 mm x 39 (M43) cartridge.

[0026] The inventive ratio of the projectile diameter G1 to the cartridge case neck length (L3-L2) can also be applied to the cartridge chamber, which is designed complementarily to the cartridge: Here, the difference between the length L3, i.e., the length of the cartridge chamber up to the diameter H2, and the length L2, i.e., the length of the cartridge chamber up to the diameter H1, is considered. This difference between L3 and L2 can be selected such that the ratio of the diameter of the projectile transition (G1; diameter at the beginning of the transition of the grooves of the cartridge chamber) to the aforementioned difference L3-L2 is between 1.13 and 1.27, preferably 1.19. The length L3 of the cartridge chamber to the diameter H2 can be between 37.80 mm (1.4882") and 40.80 mm (1.6063"), preferably between 38.50 mm (1.5157") and 40.00 mm (1.5748"), preferably between 39.00 mm (1.5354") and 39.50 mm (1.5551"), particularly preferably 39.30 mm (1.5472"), and the diameter G1 of the projectile transition can be 7.95 mm (0.313"). This ratio leads to the advantages according to the invention, already described with regard to the cartridge.

[0027] The cartridge chamber is designed as a shoulder-mounted chamber, so that the cartridge according to the invention rests in the cartridge chamber with its shoulder cone on the complementary shoulder cone of the cartridge chamber.

[0028] The diameter (H1) of the case neck can be 8.64 mm (0.3402") and preferably the chamber can have a radius (r1 max) of 1.00 mm (0.0394") at the transition from the case body to the shoulder cone (α) and a radius (r2) of 2.00 mm (0.0787") at the transition from the shoulder cone to the case neck. In conjunction with the further design features of the chamber, as already explained with regard to the corresponding radii of the shoulder cone on the cartridge, the chamber according to the invention can be used not only for the cartridge according to the invention, but also for cartridges in caliber 7.62 mm x 39 (M43).

[0029] The invention also relates to a combination of the breech and chamber of a firearm, comprising a chamber according to the invention, wherein the chamber is designed to be complementary such that the maximum headspace (Fe), i.e., the distance between the cartridge case head and the closed breech of the firearm, is between 0.00 mm (0.00") and 0.15 mm (0.006") for a cartridge designed according to the invention and fed into the chamber. Thus, the headspace can be 0.10 mm (0.004") for the cartridge according to the invention and 0.15 mm (0.006") for the cartridge in caliber 7.62 mm x 39 (M43).

[0030] Furthermore, the present invention relates to a firearm comprising a cartridge chamber according to the invention or a combination of breech and cartridge chamber according to the invention. The firearm can be a handgun, short-range firearm such as a pistol, submachine gun or machine gun.

[0031] The invention will now be described in more detail below, together with a description of a preferred embodiment, with reference to the figures.

[0032] They show: Fig. 1 an embodiment of the cartridge according to the invention; Fig. 2 an embodiment of the cartridge chamber according to the invention; Fig. 3 a sectional view of the cartridge according to the invention, inserted into the cartridge chamber according to the invention with the breech closed; Fig. 4 a schematic representation of a possible firearm according to the invention; Fig. 5 the dimensions of a preferred embodiment of the cartridge according to the invention; Fig. 6 the dimensions of a preferred embodiment of the cartridge chamber according to the invention; Fig. 7 a technical sectional view of a cartridge according to the invention inserted into the cartridge chamber according to the invention (top view) and a cartridge caliber 7.62 x 39 (M43) (bottom view).

[0033] In Fig. 1Figure 1 shows an embodiment of the cartridge 1 according to the invention. The cartridge 1 according to the invention is designed in the manner of a bottleneck cartridge case, such as a rimless rifle cartridge with centerfire ignition, and comprises a case base 2 with an extractor groove 3, a case body 4 adjoining it for receiving the propellant charge, wherein the case body 4 transitions via a shoulder cone 5 into a case neck 6, the case neck of which receives a projectile 8 with its case mouth 7. As can be seen, the case body is conically tapered in the direction of the projectile 8. The same applies to the shoulder cone 5.

[0034] A possible, preferred embodiment (best-practice embodiment) of the cartridge according to the invention (maximum dimensions), as shown in Fig. 5 (Dimensions in mm) shown, can look like this: The case length to shoulder (L1) is set at 30.456 mm (1.199"). The case length to shoulder-neck junction (L2) is 32.786 mm (1.291"). The overall case length (L3) is 39.00 mm (1.535") and the maximum cartridge length (L6) is 56.00 mm (2.205"). The case head dimensions are specified as follows: The rim height (R) is 1.50 mm (0.059"). The rim diameter (R1) is 11.35 mm (0.447"). The case head height (E) is 3.20 mm (0.126"). The extractor groove diameter (E1) is 9.56 mm (0.376"). The extractor groove height (e min) is 1.00 mm (0.039"). The extractor groove chamfer angle (δ) is 51°58'12". The rim chamfer length (f) is 0.25 mm (0.010"). The rim chamfer angle (β) is 45°. The dimensions of the powder chamber diameter at the transition between the case body and extractor groove (P1) are 11.35 mm (0.447"), and the diameter at the transition between the shoulder cone and the case neck (P2) is 10.773 mm (0.424").The dimensions of the shoulder cone are defined as follows. The shoulder angle (α) has a half-angle of 25°. The length to the apex of the shoulder angle (S) is 42.007 mm (1.654"). A radius (r1 min) of 1.50 mm (0.059") is provided at the transition from the case body to the shoulder cone, and a radius (r2) of 1.50 mm (0.059") is provided at the transition from the shoulder cone to the case neck. Dimensioning the case within the limits of its design and function allows for a maximum volume of propellant powder, a lower powder column, more uniform combustion of the propellant powder, and thus maximum internal and external ballistic performance. This also has a positive effect on muzzle velocity (v0), which in turn improves accuracy in both supersonic and subsonic ranges.The more even and efficient combustion of the propellant powder is particularly important in firearms with silencers, as these are inherently more prone to fouling than firearms without silencers, which in turn greatly impacts the firearm's reliability. The design of the case shoulder also results in an additional increase in the case neck length (L3-L2). The case neck diameter at the shoulder-neck junction (H1) and at the case mouth (H2) is 8.60 mm (0.339").

[0035] The bullet diameter at the case mouth (G1) is 7.92 mm (.312"). The length to the bore diameter (L3+G) is 47.30 mm (1.862"). Fig. 2 is one embodiment of the, for in Fig. 1 The illustrated cartridge 1 shows a complementary cartridge chamber 10, which is designed as a shoulder-mounted chamber.

[0036] A possible, preferred embodiment (best-practice embodiment) of the cartridge chamber according to the invention (minimal dimensions), as shown in Fig. 6 (Dimensions in mm) shown, can look like this: The length (L1) of the chamber to diameter P2 is 30.323 mm (1.194"). The length (L2) of the chamber to diameter H1 is 32.643 mm (1.285"). The length (L3) of the chamber to diameter H2 is set at 39.30 mm (1.547"). The distance from the breech face to the chamber entrance (E) is 3.20 mm (0.126"). The diameter at the chamber entrance, or at distance E (P1), is 11.38 mm (0.448"). The diameter at the beginning of the shoulder cone, at distance L1 (P2), is 10.803 mm (0.425"). The half-angle (α) of the shoulder cone is 25 degrees. The length to the tip of the shoulder cone (S) is 41.907 mm (1.65"). The radius of the transition at the end of diameter P2 (r1 max) is 1.00 mm (0.039") and at the transition from the shoulder cone to the case neck (r2) the radius is 2.00 mm (0.0787").These chamber radii (r1 max and r2) are specifically designed to ensure maximum reliability depending on the different radii (r1 min and r2) of the respective cartridges. When the 7.62 mm x 39 (M43) cartridge is fired from the chamber according to the invention, the precisely defined headspace is determined, among other design features, by the radii r2 of the respective cartridge (cartridge according to the invention and cartridge 7.62 mm x 39 (M43)) and the chamber according to the invention. The diameter at the beginning of the case neck at distance L2 (H1) is 8.64 mm (0.34"). The diameter at distance L3 (H2) is 8.63 mm (0.34"). The diameter at the beginning of the transition between the sections (G1) is 7.95 mm (0.313") and the distance between H2 and F (G) is 8.301 mm (0.327"). The angle of the transition between H2 and G1 (α1) is 90°. The distance between H2 and G1 (h) is 0.34 mm (0.013").The length between the cylindrical transition plus the neck chamfer (s) is 2.00 mm (0.079"). Half the angle of inclination at the rifling transition (i) is 1.5°. The bore diameter (F) is 7.62 mm (.300") and the rifling diameter (Z) is 7.92 mm (.312"). The maximum headspace (Fe) of the cartridge according to the invention in the chamber according to the invention is set at 0.10 mm (0.004"). The headspace of 0.10 mm (0.004") is the maximum permissible headspace for centerfire rifle cartridges with a mean maximum permissible gas pressure (P max) exceeding 3800 bar (55,115 psi) according to CIP. When the 7.62 mm x 39 (M43) cartridge is loaded into the cartridge chamber according to the invention, the maximum headspace (Fe) is the legally defined maximum headspace (Fe) of 0.15 mm (0.004").006"), which is permissible for centerfire rifle cartridges at a mean maximum permissible gas pressure (P max) of up to 3800 bar (55115 psi). The design of the respective different maximum headspaces for the cartridges according to the invention and the 7.62 mm x 39 (M43) cartridge is unique and contributes to the maximum operational reliability of the firearm, even under adverse conditions.

[0037] In Fig. 3 Figure 1 shows a non-scale sectional view of a combination of the breech and the cartridge chamber according to the invention of a firearm through the longitudinal center axis of the cartridge 1. The cartridge 1 can be, as in Fig. 1 shown and the cartridge chamber 10 can be seen as in Fig. 2 depicted, executed.

[0038] The breech clearance (Fe), i.e. the distance between the cartridge case head and the closed breech of the firearm according to the invention, is between 0.00 mm (0.00") and 0.15 mm (0.006").

[0039] Furthermore, in Fig. 4 A schematic representation of a possible firearm 12 is shown. This can, for example, be designed as a support weapon, such as a machine gun, and the object of the Fig. 3 include.

[0040] The Fig. 7 Figure 1 shows a technical sectional view of a cartridge according to the invention inserted into the cartridge chamber according to the invention (top view) and a cartridge caliber 7.62 x 39 (M43) (bottom view). The top view shows that the cartridge 1 according to the invention fits snugly into the cartridge chamber 10 according to the invention (see Detail E), i.e., its outer contour conforms to the complementary inner contour of the cartridge chamber 10 and it has a headspace (Fe) of 0.10 mm (0.004") (see Detail I).

[0041] Based on the illustration below and detail F, it can be seen that the 7.62 mm x 39 (M43) cartridge can also be loaded and fired in the cartridge chamber according to the invention while maintaining the precisely defined headspace of 0.15 mm (0.006"). This is particularly due to the contractive design according to the invention for backward compatibility.

[0042] The cartridge according to the invention is superior to the known cartridges mentioned above due to its significantly higher effectiveness in the supersonic range, combined with the backward compatibility of the associated cartridge chamber with the 7.62 mm x 39 (M43) cartridge, which is inferior in terms of maximum performance parameters, and its ability to fire projectiles in the subsonic range. The invention thus closes the existing capability gap. The cartridge according to the invention, as well as a firearm according to the invention with the cartridge chamber according to the invention, enable a significant increase in tactical options, improved endurance and survivability, and contribute to the success of complex and extreme combat operations of the highest intensity in urban environments. Reference sign

[0043] 1 Cartridge 2 Case base 3 Extractor groove 4 Case body 5 Shoulder cone 6 Case neck 7 Case mouth 8 Projectile 9 Cartridge chamber 10 Cartridge chamber 11 Breech 12 Firearm Reference mark cartridge

[0044] L1 Length to shoulder cone L2 Length to shoulder cone-neck transition L3 Case length L6 Cartridge length / Overall length R Rim height R1 Rim diameter E1 Extractor groove diameter E Case base height f Length of rim chamfer β Chamfer angle at rim δ Extractor groove chamfer angle P1 Diameter of case body-extractor groove transition P2 Diameter of shoulder cone-neck transition α Shoulder cone angle S Length to apex of shoulder cone angle r1 min Shoulder radius r2 Neck radius H1 Diameter at shoulder cone-neck transition H2 Diameter at case mouth G1 Bullet diameter at case mouth Reference mark cartridge chamber

[0045] L1 Length of chamber to diameter P2 L2 Length of chamber to diameter H1 L3 Length of chamber to diameter H2 R Distance from breech face to rear edge of barrel R1 Diameter of breech face E Distance from breech face to chamber entrance P1 Diameter at chamber entrance or at distance E P2 Diameter at the start of shoulder cone at distance L1 α Angle of shoulder cone S Length to the tip of shoulder cone r1 max Radius of transition at end of diameter P2 r2 Radius of transition at neck H1 Diameter at the start of neck at distance L2 H2 Diameter at distance L3 G1 Diameter at the start of rifling transition G Distance between H2 and F i Half angle of inclination at rifling transition F Land diameter of barrel Z Groove diameter of barrel

Claims

1. Cartridge (1) for a firearm (12) comprising a cartridge case implemented in the manner of a bottleneck cartridge case for receiving a projectile (8), wherein the cartridge case has an overall length (L3) of 38.50 mm (1.5157") to 40.50 mm (1.5945"), preferably of 38.50 mm (1.5157") to 39.50 mm (1.5551"), particularly preferably of 39.00 mm (1.5354"), and the length of the case neck - case neck length (L3-L2) - is selected such that the ratio of the diameter (G1) of the projectile (8) to the case neck length (L3-L2) of the cartridge case is between 1.26 and 1.36, and preferably between 1.26 and 1.27.

2. Cartridge (1) according to claim 1, characterized in that the cartridge case, preferably the bottleneck cartridge case, is implemented as a rimless rifle cartridge having a centerfire primer, and preferably the length (L2) from the bottom to the transition from shoulder cone to case neck (H1) is 31.69 mm (1.2476") to 33.89 mm (1.3343"), preferably 32.29 mm (1.2713") to 33.29 mm (1.3106"), particularly preferably 32.79 mm (1.2909").

3. Cartridge (1) according to claim 1 or 2, characterized in that the diameter of the projectile (8) is 7.85 mm (0.309") to 7.92 mm (0.312") and preferably 7.92 mm (0.312"), and preferably the diameter (H1) of the case neck is 8.60 mm (0.3386").

4. Cartridge (1) according to any one of the claims 1 to 3, characterized in that the length of the case neck (L3-L2) is 5.81 mm (0.2287") to 6.61 mm (0.2602").

5. Cartridge (1) according to any one of the claims 1 to 4, characterized in that the maximum overall length (L6) of the cartridge (1) is 55.00 mm (2.165") to 57.00 mm (2.244"), preferably 55.70 mm (2.1929") to 56.30 mm (2.165"), particularly preferably 56.00 mm (2.2047").

6. Cartridge (1) according to any one of the claims 1 to 5, characterized in that a shoulder cone (5) connects to the case neck (6) and transitions into the case body (4) of the cartridge case, wherein the case body (4) connects to an extractor groove (3) of the cartridge (1) at the case bottom (2) and is preferably implemented having a conical taper in the direction from the extractor groove (3) toward the shoulder cone (5), such that the case body (4) has a diameter (P1) of 11.35 mm (0.4469") at the connection to the extractor groove (3) and a diameter (P2) of 10.07 mm (0.3965") to 11.350 mm (0.4469"), preferably of 10.45 mm (0.4114") to 11.00 mm (0.4331"), particularly preferably of 10.773 mm (0.4241"), at the connection to the shoulder cone (5).

7. Cartridge (1) according to claim 6, characterized in that a radius (r1min) of 1.50 mm (0.0591") is provided at the transition from the case body (4) to the shoulder cone (5) and a radius (r2) of 1.50 mm (0.0591") is provided at the transition from the shoulder cone (5) to the case neck.

8. Cartridge (1) according to claim 6 or 7, characterized in that the shoulder cone (5) is implemented having a conical taper toward the case neck (6) and a half angle (α) of 20° to 42.5°, preferably between 20° and 30°, particularly preferably 25°.

9. Cartridge chamber (10) for a firearm (12), wherein the cartridge chamber (10) has a cartridge space (9) comprising a case neck (6) to which a shoulder cone (5) connects and transitions into the case body (4) of the cartridge space (9), wherein the cartridge space (9) is implemented complementarily for receiving a cartridge (1) according to any one of the claims 1 to 8.

10. Cartridge chamber (10) according to claim 9, characterized in that the length (L3) of the cartridge chamber (10) up to the diameter H2 is 38.50 mm (1.5157") to 40.80 mm (1.6063"), preferably 38.50 mm (1.5157") to 40.00 mm (1.5748"), preferably 39.00 mm (1.5354") to 39.50 mm (1.5551"), particularly preferably 39.50 mm (1.5472"), and the difference between the length L3 and the length L2 of the cartridge chamber (10) is selected such that the ratio of the diameter of the projectile transition (G1) to the difference between L3 and L2 is 1.13 to 1.27, preferably 1.19.

11. Cartridge chamber (10) according to claim 9 or 10, characterized in that the cartridge chamber (10) is implemented having shoulder contact, so that the shoulder cone (5) of a cartridge (1) inserted into the cartridge chamber (10) contacts the complementary shoulder cone (5) of the cartridge chamber (10).

12. Cartridge chamber (10) according to claim 11, characterized in that the diameter (H1) of the case neck is 8.64 mm (0.3402"), and the cartridge space (9) preferably has a radius (r1max) of 1.00 mm (0.0394") at the transition from the case body (4) to the shoulder cone (5) and a radius (r2) of 2.00 mm (0.0787") at the transition from the shoulder cone (5) to the case neck (6).

13. Combination of a breech (11) and a cartridge chamber (10) for a firearm (12) comprising a cartridge chamber (10) according to any one of the claims 9 to 12, characterized in that the cartridge chamber (10) is implemented such that a breech clearance (Fe), that is, the spacing between the case bottom of the cartridge (1) and the closed breech (11) of the firearm (12), is 0.00 mm (0.000") and 0.15 mm (0.006") for a cartridge (1) preferably according to any one of the claims 1 to 8 and inserted into the cartridge chamber (10).

14. Combination according to claim 13, characterized in that the cartridge chamber (10) is capable of receiving a cartridge (1) of caliber 7.62 mm x 39 (M43), wherein the breech clearance (Fe) is between 0.00 mm (0.000") and 0.15 mm (0.006").

15. Firearm (12) comprising a cartridge chamber (10) according to any one of the claims 9 to 12 or a combination of a breech (11) and a cartridge chamber (10) according to claim 13 or 14, wherein the firearm (12) is preferably a handgun, a small arm, such as a sidearm, a submachine gun, or a machine gun.