Hodgdon Retumbo is a premium, extruded reloading powder specifically formulated for large, overbored rifle cartridges. As an "Extreme Powder", Retumbo is an excellent choice for serious hunters and sport shooters in New Zealand and worldwide, seeking increased velocity and consistent results for big game hunting applications. This high-performance propellant delivers a significant velocity increase of 40-100 feet per second, making it particularly well-suited for cartridges such as the 7mm Remington Ultra Magnum, 300 Remington Ultra Magnum, and 30-378 Weatherby Magnum. Its consistent burn characteristics ensure reliable performance across a range of temperatures and conditions, making it ideal for varying outdoor conditions.