IMR 4064 Smokeless Powder imr 4064 is easily the most versatile propellant within the IMR line, useful for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Brief Magnum, 308 Winchester, 338 Winchester Magnum, as well as checklist goes on and on. Flexibility with uniformity and accuracy. https://joshw357tww1.wikilinksnews.com/user