7×33mm Sako

The 7×33mm Sako cartridge was created in Finland in 1942 as a small game cartridge for animals such as the Capercaillie and Black Grouse. It is based on a 9×19mm Parabellum case that has been lengthened and necked down to accept a 7.21 mm (0.284 in) bullet. The cartridge overall length is 44.30 mm (1.744 in), with a case length of 33.30 mm (1.311 in) and a base diameter of 10 mm (0.39 in). The bottleneck bends at 26.50 mm (1.043 in) (diameter 9.50 mm (0.374 in)) and straightens at 29.12 mm (1.146 in) (diameter 7.80 mm (0.307 in)). The Bertram company of Australia makes brass for it. Sako offers two loadings: a 78 gr (5.1 g) FMJ, and a 78 gr soft nose.

7×33mm Sako
Type	Rifle
Place of origin	Finland
Production history
Designer	Sako
Designed	1942
Manufacturer	Sako
Produced	1942–1960s
Specifications
Parent case	9×19mm Parabellum
Case type	Rimless, bottlenecked
Bullet diameter	7.26 mm (0.286 in)
Neck diameter	7.9 mm (0.31 in)
Shoulder diameter	9.5 mm (0.37 in)
Rim diameter	10 mm (0.39 in)
Rim thickness	1.27 mm (0.050 in)
Case length	33.3 mm (1.31 in)
Overall length	44.4 mm (1.75 in)
Rifling twist	1 turn in 401.32 mm (15.800 in)
Primer type	Small rifle
Maximum pressure	40,611 psi (280,000 kPa)
Ballistic performance
Bullet mass/type Velocity Energy 78 gr (5 g) JHP/FMJ 732 m/s (2,400 ft/s) 1,353 J (998 ft⋅lbf)
Test barrel length: 24 in (610 mm) Source(s): Ammo Encyclopedia, 2nd Edition, Page 395, Michael Brussard

Rifles chambered in this caliber include the Sako Models L42 and L46.

See also

• List of rifle cartridges
• 7 mm caliber

References

• https://web.archive.org/web/20080302013841/http://www.thegunzone.com/carbine-wildcat.html
• https://web.archive.org/web/20110714091350/http://www.midwayuk.com/apps/eproductpage.exe/showproduct?SaleItemID=506583
• https://www.ssaa.org.au/stories/historical-collecting-cartridges.html