7×33mm Sako

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7×33mm Sako
Type Rifle
Place of origin  Finland
Production history
Designer Sako
Designed 1942
Manufacturer Sako
Produced 1942-1960s
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.[1]

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

See also[edit]