IMR 4064 Smokeless Powderimr 4064 is the most adaptable propellant from the IMR line, employed for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Small Magnum, 308 Winchester, 338 Winchester Magnum, along with the list goes on and on. Flexibility with uniformity and precision.This smokeless powder is a smokeless me