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300 RUM Ammo

The .300 Remington Ultra Magnum, also known as the .300 Ultra Mag' or .300 RUM ammo is a 7.62 mm (.300in.) caliber rifle ammunition cartridge, 7.62x72mm, or .30 caliber rifle cartridge introduced by Remington Arms in 1999.

The .300 Remington Ultra Magnum is one of the largest commercially available .30 caliber magnums currently being produced.

It is a beltless, rebated rim cartridge, capable of handling all large North American game, as well as long-range shooting.

Buy rifle ammunition online and invest in the best .300 RUM brass for sale today!