IMR 4064 Smokeless Powder imr 4064 is the most multipurpose propellant in the IMR line, employed for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Small Magnum, 308 Winchester, 338 Winchester Magnum, as well as the record goes on and on. Versatility with uniformity and precision. https://bruceu356qrq8.wikinarration.com/user