Hodgdon Extreme Retumbo Rifle Powder is designed specifically for extremely large over-bored cartridges including .300 Remington Ultra Magnum 7mm Remington Ultra Magnum and .30-378 Weatherby Magnum among others. This powder is capable of adding between 40 and 100 feet per second creating greater velocities compared to other magnum powders of the same type. Another benefit of this rifle powder is that it performs regardless of condition. Because of this it is not only used for reloading but has the ability to take down big game. Whether purchased in 1- or 8-pound containers this powder is an incredible buy.