.300 Norma Magnum

The .300 Norma Magnum is a cartridge that has begun to gain popularity in the long range shooting community. The .300 Norma Magnum is a .338 Norma Magnum case necked down to .308 caliber.[1] This cartridge was named .300 Norma Magnum to differentiate it from the .308 Norma Magnum designed in 1960. The United States Special Operations Command (SOCOM) has selected .300 Norma Magnum as their new Advanced Sniper Rifle Cartridge (2016).

.300 Norma Magnum
Place of originSweden
Production history
Parent case.338 Norma Magnum
Case typeRimless, bottleneck
Bullet diameter7.83 mm (0.308 in)
Neck diameter8.68 mm (0.342 in)
Shoulder diameter14.29 mm (0.563 in)
Base diameter14.87 mm (0.585 in)
Rim diameter14.93 mm (0.588 in)
Rim thickness1.52 mm (0.060 in)
Case length63.30 mm (2.492 in)
Overall length93.50 mm (3.681 in)
Case capacity6.75 cm3 (104.2 gr H2O)
Rifling twist229 mm (1 in 9 in)
Primer typeLarge rifle magnum
Maximum pressure (CIP)440.00 MPa (63,817 psi)
Ballistic performance
Bullet mass/type Velocity Energy
220 gr (14 g) MatchKing 3,003 ft/s (915 m/s) 4,404 ft⋅lbf (5,971 J)
Source(s): Cartridges of the World, 2012

According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the .300 Norma Magnum can handle up to 440.00 MPa (63,817 psi) Pmax piezo pressure.[2]


  1. ^ Barnes, Frank C. (2012). Richard A. Mann (ed.). Cartridges of the World (13th ed.). p. 471. ISBN 1440230595.
  2. ^ "C.I.P. TDCC datasheet 300 Norma Mag" (PDF). CIP. Archived (PDF) from the original on 12 July 2013. Retrieved 4 July 2013. CS1 maint: discouraged parameter (link)

External linksEdit