8×63mm patron m/32
Two 8×63mm patron m/32 military cartridges
|Place of origin||Sweden|
|Wars||UN intervention in Kongo 1960-1964|
|Designer||Kungliga Armétygförvaltningen (KAF), AB Bofors|
|Designed||late 1920s, early 1930s|
|Case type||Rimless, bottleneck|
|Bullet diameter||8.20 mm (0.323 in)|
|Neck diameter||9.10 mm (0.358 in)|
|Shoulder diameter||11.51 mm (0.453 in)|
|Base diameter||12.43 mm (0.489 in)|
|Rim diameter||12.18 mm (0.480 in)|
|Rim thickness||1.42 mm (0.056 in)|
|Case length||62.81 mm (2.473 in)|
|Overall length||84.62 mm (3.331 in)|
|Primer type||Large rifle|
|Test barrel length: 609 mm (24 in)|
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 finalization of the re-chambering process of these machine guns to 7.62×51mm NATO in 1975.
In the late 1920s, 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 which was not considered effective enough for anti-aircraft and indirect fire so the Royal Army Administration tasked AB Bofors to manufacture a larger rifle cartridge to meet these needs.
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 like the 6.5×55mm had an uncommon 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 mm S bore 14.2 g (219.1 gr) bullets and had more muzzle energy.
The patron m/32's boat-tailed spitzer bullets had an effective range of approximately 3,600 m (3,937 yd) on which the impact energy was 196 J (145 ft⋅lbf), and a maximum range of approximately 5,500 m (6,015 yd) when fired from a kulspruta m/36. 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:
The 8×63mm patron m/32 was also used in the gevär m/40 bolt-action rifle. These were Karabiner 98k's re-chambered in Sweden for the patron m/32 and issued to the machine gun troops so their rifles would fire the same round as their machine guns. There are statements the gevär m/40 originally was intended as a stop-gap anti-tank rifle, but this has yet to be confirmed.
|Wikimedia Commons has media related to 8×63mm patron m/32.|
- 8x63 M32 Bofors
- HISTORIC MACHINE GUN CARTRIDGES by Anthony G Williams
- 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 för armén, 1960