7×33mm Sako

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	7.6 mm (.2858 in.)
Neck diameter	7.9 mm (.311 in)
Shoulder diameter	9.5 mm (.3748 in)
Rim diameter	10 mm (.3937 in.)
Rim thickness	1.27 mm (.50 in)
Case length	33.3 mm (1.3122 in.)
Overall length	44.4 mm (1.7496 in.)
Rifling twist	1 turn in 401.32 mm (15.8 in)
Primer type	Small Rifle
Maximum pressure	40,611 psi
Ballistic performance
Bullet mass/type Velocity Energy 78 gr. JHP/FMJ 732 m/s (2,400 ft/s) 1353 J (998 ft.-lbf.)
Test barrel length: 24 in. Source(s): Ammo Encyclopedia, 2nd Edition, Page 395, Michael Brussard

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 7.21mm bullet. The cartridge overall length is 44.30mm with a case length of 33.30mm and a base diameter of 10mm. The bottleneck bends at 26.50 mm (dia 9.50 mm) and straightens at 29.12 mm (dia 7.80mm). The Bertram company of Australia makes brass for it. Sako offers two loadings, a 78gr (5.1g) FMJ and a 78gr soft nose.

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

See also

• List of rifle cartridges

References

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