.338 RUM Ammunition

Also known as: 338 rum, 338 Remington Ultra Magnum, .338 Remington Ultra Magnum

The .338 Remington Ultra Magnum is a beltless rebated rim cartridge released in 2008. It was based on the 300 Rem Ultra Magnum but features a case capacity that mirrors the .338 Lapua Magnum. It is currently one of the most powerful 338 caliber rounds available.

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