50 factory new Remington unprimed 300 Remington Ultra Magnum (300 RUM) shell cases.
Brass case mouths MAY not be perfectly round from the manufacturing process, this can be corrected by running brass through the size die (always recommended) prior to loading
History: The Remington Ultra Magnum family with the 300 in 1999. The design is based on the beltless 404 Jeffrey. The concept is cases without a belt is to increase powder capacity while using the same diameter bolt face. The result is a increase of approximately 200 feet per second gain over the 300 Win Mag, to do so a large charge of slow burning powders are needed.