This magnum, extruded powder was designed expressly for the really large overbored cartridges such as the 7mm Remington Ultra Magnum, 300 Remington Ultra Magnum, 30-378 Weatherby Magnum, etc. Retumbo adds 40-100 fps more velocity to these cartridges when compared to other normal magnum powders.

In addition, it is an Extreme Powder, making it perfect for big game hunting under all types of conditions.

Available in 1 lb. and 8 lb. containers.

H4831SC is an Extreme extruded powder and the exact ballistic copy of H4831. Physically, it has a shorter grain size which earned it the “SC” designation for “short cut.” The shorter, more compact kernels allow the powder to flow through the powder measures more smoothly, helping to alleviate the constant cutting of granules. With the smoother flow characteristics comes more uniform charge weights, while the individual grains orient more compactly, creating better loading density.

As an Extreme Extruded propellant, it shares the fine quality of insensitivity to hot and cold temperatures, as well as superb uniformity from lot to lot.

It is a favorite for cartridges like the 270 Winchester, 25-06 Remington, 280 Remington and 300 Winchester Magnum.

Available in 1 lb. and 8 lb. containers.

This Extreme series powder has likely won more benchrest matches than all other propellants combined.

H322 provides match-grade accuracy in small- and medium-capacity cartridges like the 223 Remington, 6mm PPC and the 7mm TCU.

As a fine extruded powder, it flows through powder measures with superb accuracy.

Available in 1 lb. and 8 lb. containers.