IMR 4064 Smokeless Gun PowderIMR 4064 is a medium-range burn speed powder and is one of the most versatile propellant in the IMR line, used for 223 Remington, 22-250 Remington, 220 Swift, 6mm 4064 imr powder Remington, 243 Winchester Super Short Magnum, 308 Winchester, 338 Winchester imr 4064 powder Magnum, and the list goes imr 4064 powder on and