Hodgdon Retumbo Smokeless Powder 1 lb Canister Hodgdon Retumbo is a magnum, extruded powder designed expressly for the largest overbore cartridges. It adds 40-100 fps more velocity to these cartridges compared to other normal magnum powders, and as an Extreme powder, it is perfect for big-game hunting in all conditions. Overview Retumbo was built for cartridges with very large case capacities and relatively small bores, delivering a meaningful velocity advantage while holding the temperature stability that defines Hodgdon's Extreme powder line. Best Uses & Typical Calibers 7mm Remington Ultra Magnum .300 Remington Ultra Magnum .30-378 Weatherby Magnum 7mm STW Key Benefits Adds 40-100 fps over other magnum powders in overbore cartridges Extreme-series temperature stability Ideal for big-game hunting in all conditions Made in Australia Reloading Notes Always use published load data from reliable sources for your chosen cartridge and bullet. Start with the minimum recommended load and work up carefully, watching for pressure signs. Store powder safely and follow established reloading practices. *Powders are non-returnable*