8×63mm patron m/32

8×63mm

Two 8×63mm patron m/32 military cartridges
Type Rifle
Place of origin  Sweden
Service history
In service 1932–1975
Used by Sweden
Wars UN intervention in Kongo 1960-1964
Production history
Designer KAF, AB Bofors
Designed late 1920s, early 1930s
Manufacturer AB Bofors
Specifications
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
Ballistic performance
Bullet mass/type Velocity Energy
9.72 g (150 gr) FMJ 930 m/s (3,100 ft/s) 4,203 J (3,100 ft·lbf)
11.0 g (170 gr) FMJ 860 m/s (2,800 ft/s) 4,068 J (3,000 ft·lbf)
14.2 g (219 gr) m/32 FMJ 760 m/s (2,500 ft/s) 4,101 J (3,025 ft·lbf)
14.6 g (225 gr) FMJ 747 m/s (2,450 ft/s) 4,073 J (3,004 ft·lbf)
Test barrel length: 609 mm (24 in)
Source(s): [1]

The 8×63mm patron m/32 was a bottlenecked centerfire 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 rechambering 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 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 8×63mm 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 an uncommon 12.2 mm (0.48 in) diameter bolt face. Compared to the 1928 pattern .30-06 Springfield .30 M1 Ball the 8x63mm patron m/32 was loaded with 8mm S bore 14.2 g (219 gr) bullets and had more muzzle energy.[2] The 8×63mm patron m/32 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.[3]

The 8×63mm cartridge was used in the following machine guns:[4]

The 8×63mm was also used in the gevär m/40 bolt-action rifle. These were Karabiner 98k's rechambered in Sweden for the 8×63mm and issued to the machine gun troops so their rifles would fire the same round as their machine guns.

See also

References

  1. ↑ 8x63 Swedish / 8x63 Bofors (in Russian)
  2. ↑ Sammanfattning av rapport Till Kungl. Arméförvaltningens artilleridepartement (in Swedish)
  3. ↑ Swedish Kulspruta m/36 at forgottenweapons.com
  4. ↑ Arméplanch för utbildning fotograferad av Göta Vapenhistoriska Sällskap (in Swedish)
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