338 Lapua Magnum pic-1
.338 Lapua Magnum

Accuracy International Ltd. (Great Britain)
Sako (Finland)
Erma Werke (Germany)
Mauser (Germany)
G. McMillan & Co. (United States of America)
Heym Jagdwaffen (Germany)
Keppeler & Fritz (Germany)


Lapua State Cartridge Factory

Year(s) designed


Year production began


Cartridge type

Centerfire; bottlenecked

Parent cartridge

.416 Rigby, .338/416

Overall length

93.5mm (3.681 in)

Case length

69.2mm (2.724 in)

Neck diameter


Shoulder diameter


Base diameter


Rim diameter


Rim thickness


Rifling twist

254mm (1:10 in)

Muzzle velocity

837 to 1005 m/s (2750 to 3300 ft/s)

Primer type

Large rifle magnum

Used by

Multiple official and civil users

The .338 Lapua Magnum (8.6×70mm or 8.58×70mm in metric) is a magnum centerfire rifle cartridge. It was designed by Lapua State Cartridge Factory, in Finland.

Design detailsEdit

The .338 Lapua Magnum cartridge is a rimless, bottlenecked centerfire cartridge. It is based on the .416 Rigby cartridge, from which it was formed. The .416 case was shortened and necked down to take a .338-caliber bullet.

This cartridge has a case capacity of 114 grains, a case length of 2.724 inches, and an overall length of 3.681 inches. It uses a large rifle magnum primer, and fires bullets weighing from 160 grains to 300 grains at muzzle velocities ranging from ~2500 FPS for heavier bullets, up to 3610 FPS for lighter bullets. It fires with a maximum pressure of around 63,000 PSI.[1]


  1. Choose .338 Lapua Magnum from the drop-down menu

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