The 8×63mm patron m/32 was a bottlenecked centrefirecartridge with a slightly (0.25 mm (0.0098 in)) rebated rim for Swedish heavy and mediummachine guns. It was used from 1932 to the finalisation of the re-chambering process of these machine guns to 7.62×51mm NATO in 1975.
Left; 8×63mm patron m/32 cartridge with 14.2 g (219.1 gr) m/32 bullet Right; 7.92×57mm Mauser cartridge and 11.55 g (178.2 gr) S.m.E. (mild steel cored) 8 mm S bore bullet
Given the experiences of the devastating effect of small arms fire, including the long-range, even indirect fire of the machine guns, in the Russo-Japanese War and World War I, as well as a revolution in terminal ballistic calculations, calibre-related concerns occupied a lot of attention worldwide in military establishments.[2] Sweden was no exception, and series of trials in calibres 6mm-12mm were conducted until the late 1920s.[2] At this time, the standard service cartridge in Swedish use was the 6.5×55mm Swedishskarp patron m/94 projektil m/94 (live cartridge m/94 projectile m/94) service ammunition loaded with a 10.1 grams (156 gr) long round-nosed m/94 (B-projectile) bullet. After study-travels by Lieutenant Colonel de Laval along with Captains Nygren and Holmgren, mainly to Germany and the Netherlands in October 1930, Royal Swedish Army Materiel Administration (Kungliga Armétygförvaltningen (KAF) appointed a commission that conducted a series of tests with calibres 6,5 mm to 7,2 – 7,5 – 7,9 mm, and bullet weights between 8.4 grams and 17.0 grams, with the intention to either recommend a new calibre for the kulspruta m14-29 or retain the 6.5×55mm but with a new boat tailedspitzer bullet, as the old blunt nosed projectile m/94 had inferior ballistics.[2] The commission found that at ranges below 2,400 m (2,625 yd), no recommendation could be given without indepth analysis of intended tasks within the tactical doctrine.[2] Past this, the 14.2 gram bullet in calibre 7.9mm had superior performance in precision and penetration while not causing excessive barrel wear as well as fulfilling the requirement of 20 kilogram-metres impact force up to a range of 3,600 m (3,937 yd).[2] Based on this, KAF tasked AB Bofors to develop and manufacture the larger rifle cartridge to meet these needs.[2]
Designedit
The patron m/32 round had the same overall length as the .30-06 Springfield cartridge, which allowed it to fit in the standard Browning receiver, but used a larger diameter case and share the 6.5×55mm 12.2 mm (0.48 in) diameter bolt face. Compared to the 1928 pattern .30-06 Springfield M1 Ball the 8×63mm patron m/32 was loaded with 8.20 mm (0.323 in) S bore 14.2 g (219.1 gr) bullets and had more muzzle energy. The 8×63mm patron m/32 had a muzzle velocity of 760 m/s (2,493 ft/s) and an operating pressure of 330 MPa (47,862 psi).
The patron m/32's aerodynamically refined boat tailedspitzer bullet had a useful range of approximately 3,600 m (3,937 yd) on which the impact energy was 20 kilogram-meters (196 J / 145 ft⋅lbf),[3][4] and a maximum range of approximately 5,500 m (6,015 yd) when fired from a kulspruta m/36.[5] Reverse engineering the trajectory from the previous sentence indicates a ballistic coefficient (G1 BC) of approximately 0.63. Available with armour piercing bullets, patron m/32 was used in the UN-forces' KP-bil during the Congo-crisis against the separatists' armoured cars.
The 8×63mm patron m/32 cartridge was used in the following machine guns:[6]
The 8×63mm patron m/32 was also used in the gevär / pansarvärnsgevär m/40[2] bolt-action rifle, Karabiner 98k's re-chambered in Sweden for the patron m/32. Originally purchased as the pvg m/39 in 8×57 IS as a stop-gap anti-tank rifle (despite being unsuited for the role), the re-chambered 8×63 rifles were designated m/40, and later issued to machine gun crews so their rifles would fire the same round as their machine guns. Besides the rechambering a muzzle brake was added necessitated by the additional recoil produced by the more powerful 8×63mm patron m/32 cartridge.
^ abcdefgSammanfattning av rapport Till Kungl. Arméförvaltningens artilleridepartement (in Swedish)
^The useful maximum range is defined by the maximum range of a small-arms projectile while still maintaining the minimum kinetic energy required to put unprotected personnel out of action, which is generally believed to be 15 kilogram-meters (147 J / 108 ft⋅lbf).
^Kjellgren, G. L. M. "The Practical Range of Small Arms" (PDF). The American Rifleman. pp. 40–44. (PDF) from the original on 5 March 2015.
^Arméplanch för utbildning fotograferad av Göta Vapenhistoriska Sällskap (in Swedish)
External linksedit
Wikimedia Commons has media related to 8 x 63 mm m/32.
HISTORIC MACHINE GUN CARTRIDGES by Anthony G Williams 2022-03-03 at the Wayback Machine
8x63 Swedish / 8x63 Bofors (in Russian)
The Swedish military ammunition site
Ammunitionsregister för armén, 1960
instruction drawings of 8×63mm patron m/32 ammunition
Military Small Arms Ammunition of the World, 1945-1980, P. Labbett
November 19, 2023
63mm, patron, bottlenecked, centrefire, cartridge, with, slightly, 0098, rebated, swedish, heavy, medium, machine, guns, used, from, 1932, finalisation, chambering, process, these, machine, guns, 51mm, nato, 1975, 63mmtwo, military, cartridgestyperifleplace, o. The 8 63mm patron m 32 was a bottlenecked centrefire cartridge with a slightly 0 25 mm 0 0098 in rebated rim for Swedish heavy and medium machine guns It was used from 1932 to the finalisation of the re chambering process of these machine guns to 7 62 51mm NATO in 1975 8 63mmTwo 8 63mm patron m 32 military cartridgesTypeRiflePlace of originSwedenService historyIn service1932 1975Used bySwedenWarsUN intervention in Kongo 1960 1964Production historyDesignerKungliga Armetygforvaltningen KAF AktieBolaget BoforsDesigned1927 1932ManufacturerAB BoforsSpecificationsCase typeRimless bottleneckBullet diameter8 20 mm 0 323 in Neck diameter9 10 mm 0 358 in Shoulder diameter11 51 mm 0 453 in Base diameter12 43 mm 0 489 in Rim diameter12 18 mm 0 480 in Rim thickness1 42 mm 0 056 in Case length62 81 mm 2 473 in Overall length84 62 mm 3 331 in Primer typeBerdan Large rifleBallistic performanceBullet mass type Velocity Energy14 2 g 219 gr m 32 FMJ 760 m s 2 500 ft s 4 101 J 3 025 ft lbf Test barrel length 609 mm 24 in Source s 1 Contents 1 History 2 Design 3 Military ammunition 4 See also 5 References 6 External linksHistory edit nbsp Left 8 63mm patron m 32 cartridge with 14 2 g 219 1 gr m 32 bulletRight 7 92 57mm Mauser cartridge and 11 55 g 178 2 gr S m E mild steel cored 8 mm S bore bulletGiven the experiences of the devastating effect of small arms fire including the long range even indirect fire of the machine guns in the Russo Japanese War and World War I as well as a revolution in terminal ballistic calculations calibre related concerns occupied a lot of attention worldwide in military establishments 2 Sweden was no exception and series of trials in calibres 6mm 12mm were conducted until the late 1920s 2 At this time the standard service cartridge in Swedish use was the 6 5 55mm Swedish skarp patron m 94 projektil m 94 live cartridge m 94 projectile m 94 service ammunition loaded with a 10 1 grams 156 gr long round nosed m 94 B projectile bullet After study travels by Lieutenant Colonel de Laval along with Captains Nygren and Holmgren mainly to Germany and the Netherlands in October 1930 Royal Swedish Army Materiel Administration Kungliga Armetygforvaltningen KAF appointed a commission that conducted a series of tests with calibres 6 5 mm to 7 2 7 5 7 9 mm and bullet weights between 8 4 grams and 17 0 grams with the intention to either recommend a new calibre for the kulspruta m14 29 or retain the 6 5 55mm but with a new boat tailed spitzer bullet as the old blunt nosed projectile m 94 had inferior ballistics 2 The commission found that at ranges below 2 400 m 2 625 yd no recommendation could be given without indepth analysis of intended tasks within the tactical doctrine 2 Past this the 14 2 gram bullet in calibre 7 9mm had superior performance in precision and penetration while not causing excessive barrel wear as well as fulfilling the requirement of 20 kilogram metres impact force up to a range of 3 600 m 3 937 yd 2 Based on this KAF tasked AB Bofors to develop and manufacture the larger rifle cartridge to meet these needs 2 Design editThe patron m 32 round had the same overall length as the 30 06 Springfield cartridge which allowed it to fit in the standard Browning receiver but used a larger diameter case and share the 6 5 55mm 12 2 mm 0 48 in diameter bolt face Compared to the 1928 pattern 30 06 Springfield M1 Ball the 8 63mm patron m 32 was loaded with 8 20 mm 0 323 in S bore 14 2 g 219 1 gr bullets and had more muzzle energy The 8 63mm patron m 32 had a muzzle velocity of 760 m s 2 493 ft s and an operating pressure of 330 MPa 47 862 psi The patron m 32 s aerodynamically refined boat tailed spitzer bullet had a useful range of approximately 3 600 m 3 937 yd on which the impact energy was 20 kilogram meters 196 J 145 ft lbf 3 4 and a maximum range of approximately 5 500 m 6 015 yd when fired from a kulspruta m 36 5 Reverse engineering the trajectory from the previous sentence indicates a ballistic coefficient G1 BC of approximately 0 63 Available with armour piercing bullets patron m 32 was used in the UN forces KP bil during the Congo crisis against the separatists armoured cars The 8 63mm patron m 32 cartridge was used in the following machine guns 6 Kulspruta m 14 29 Flygplanskulspruta m 22 Kulspruta m 36 Kulspruta m 39 Kulspruta m 42The 8 63mm patron m 32 was also used in the gevar pansarvarnsgevar m 40 2 bolt action rifle Karabiner 98k s re chambered in Sweden for the patron m 32 Originally purchased as the pvg m 39 in 8 57 IS as a stop gap anti tank rifle despite being unsuited for the role the re chambered 8 63 rifles were designated m 40 and later issued to machine gun crews so their rifles would fire the same round as their machine guns Besides the rechambering a muzzle brake was added necessitated by the additional recoil produced by the more powerful 8 63mm patron m 32 cartridge Military ammunition editDesignation Type Weights gram Propellant type Projectile material s Muzzle velocity V0 or V25 Burning range Marking RemarksCartridge Projectile Propellant8 mm sk ptr m 32 FMJ 32 1 g 495 gr 14 13 g 218 1 gr 3 6 g 56 gr Kspkr 1 0 55 Lead core Nickel jacket 750 m s V25 None Standard Ball 8 mm sk ptr m 32 For peacetime only FMJ 32 17 14 2 3 6 Kspkr 1 0 55 Lead core Nickel jacket 760 m s 2 500 ft s Blue tip Ammunition of inferior quality Used in peacetime 8 mm sk ptr m 32 Not for machine guns FMJ 32 17 14 2 3 6 Kspkr 1 0 55 Lead core Nickel jacket 760 m s Green tip Same as above but has green marking This means Not for machine guns 8 mm sk ptr m 32 pprj m 39 AP 29 7 11 8 3 6 Kspkr 1 0 55 pbr 3 2 g steel core 780 810 m s Black tip Ordinary armor piercing cartridge Penetration of 10 mm at 50 m8 mm sk ptr m 32 pprj m 40 or 8 mm pbr ptr m 32 40 AP 31 14 15 7 3 6 Kspkr 1 0 55 pbr Tungsten core 725 m s Top half black Tungsten cored ammunition Penetration of 20 mm at 0 m Only used in machine guns 8 mm sk ptr m 32 slprj m 39 Tracer 28 9 11 01 3 6 Kspkr 1 0 55 Projectile contains phosphorus no boat tail 780 824 m s red 100 800 m Red tip First marking of slprj m 39White tip Second marking of slprj m 39 8 mm sk ptr m 32 slprj m 39 with a different primer Tracer 28 9 11 01 3 6 Kspkr 1 0 55 Projectile contains phosphorus no boat tail 780 824 m s Red 100 800 m Red tip The primer is dark gray and non magnetic Likely manufactured in Germany 8 mm sk ptr m 32 brandprj m 40 citation needed Incendiary 11 55 Phosphorus and lead Yellow tip Incendiary ammunition from Hungary Trubbkula 8 mm sk ptr m 32 brandprj m 41 Incendiary AP 27 7 9 8 9 9 3 6 Kspkr 1 0 55 pbr Has an internal steel core surrounderd by fuel 835 930 m s Orange tip The ammunition is primarily for aircraft and is a semi armor piercing projectile8 mm Tysk B patron Observation cartridge High explosive incendiary Bottom halve black German B bullet loaded in a Swedish 8 63 cartridge 8 mm sk blindptr m 32 Dummy None Early marking 8 mm sk blindptr m 32 Dummy Green tip Late marking The operating pressures of the various ammunition types varied between 330 350 MPa 47 862 50 763 psi See also editList of Swedish military calibres 8 mm caliberReferences edit 8x63 Swedish 8x63 Bofors in Russian a b c d e f g Sammanfattning av rapport Till Kungl Armeforvaltningens artilleridepartement in Swedish The useful maximum range is defined by the maximum range of a small arms projectile while still maintaining the minimum kinetic energy required to put unprotected personnel out of action which is generally believed to be 15 kilogram meters 147 J 108 ft lbf Kjellgren G L M The Practical Range of Small Arms PDF The American Rifleman pp 40 44 Archived PDF from the original on 5 March 2015 Swedish Kulspruta m 36 at forgottenweapons com Armeplanch for utbildning fotograferad av Gota Vapenhistoriska Sallskap in Swedish External links edit nbsp Wikimedia Commons has media related to 8 x 63 mm m 32 8x63 M32 Bofors HISTORIC MACHINE GUN CARTRIDGES by Anthony G Williams Archived 2022 03 03 at the Wayback Machine 8x63 Swedish 8x63 Bofors in Russian 8x63 Swedish Bofors 8 mm Bofors 8x63 Swedish For MG Mod 1932 8mm SK PTR M 32 8mm Sueco 8x63 SAA 4540 XCR 08 063 BGC 010 In Spanish The Swedish military ammunition site Ammunitionsregister for armen 1960 instruction drawings of 8 63mm patron m 32 ammunition Military Small Arms Ammunition of the World 1945 1980 P Labbett Retrieved from https en wikipedia org w index php title 8 63mm patron m 32 amp oldid 1173958576, wikipedia, wiki, book, books, library,
