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.300 Lapua Magnum
The .300 Lapua Magnum (7.62 x 70 mm) is a specialized rimless bottlenecked centerfire cartridge developed for long-range rifles. The commercially successful .338 Lapua Magnum cartridge has functioned as the parent case for the .300 Lapua Magnum, which is essentially a necked-down version of the .338 Lapua Magnum. The .338 cartridge case was used for this since it has the capability to operate with high chamber pressures which, combined with smaller and hence lighter bullets result in very high muzzle velocities.
==History==
The Finnish ammunition manufacturer Lapua got the .300 Lapua Magnum C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) certified, so it became an officially registered and sanctioned member of the Finnish 70 mm "family" of super magnum rifle cartridges. The .300 Lapua Magnum is not commercially available anymore today and currently (2007) exists only as a C.I.P. datasheet. It is however still used by a few shooters who produce the cases from .338 Lapua Magnum brass by reshaping the shoulder and neck, and handloading it with .30 caliber bullets.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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