IMR 7828 is the BIG magnum powder. This slow burner gives real magnum performance to the large over-bored magnums, such as the 300 Remington Ultra Magnum, the 30-378 Weatherby Magnum, and the 7mm Remington Ultra Magnum. This powder is highly regarded by most magnum aficionados. IMR recommends always consulting www.IMRReloading.com for the most accurate, up-to-date data.
