IMR 4064 Smokeless Powderimr 4064 is among the most functional propellant inside the IMR line, employed for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Small Magnum, 308 Winchester, 338 Winchester Magnum, and the list goes on and on. Versatility with uniformity and precision.This smokeless powder is really a smo