This fine, extruded propellant is the first in the series of Enduron Technology
powders. The main features of the Enduron Technology series are copper fouling reducer,
insensitivity to temperature changes, ideal loading density and being environmentally friendly.
IMR 4166 is the perfect burn speed for cartridges like the 308 Win/7.62mm NATO, 22-250
Remington, 257 Roberts and dozens more. Positively, a versatile, match grade propellant.