Shawnee KS, IMR Legendary Powders has created a line of sophisticated extruded powders utilizing Enduron Technology. Their fine, extruded propellant features a unique copper fouling eliminator, insensitivity to temperature changes, ideal loading density and is environmentally friendly. The IMR 4451, gives top performance in the venerable 30-06, 270 Winchester and 300 Winchester Short Magnum, to name just a few. This propellant is ideally suited for many, many mid-range burn speed cartridges.