IMR 4064 Smokeless Powderimr 4064 is among the most multipurpose propellant during the IMR line, useful for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Short Magnum, 308 Winchester, 338 Winchester Magnum, and the listing goes on and on. Versatility with uniformity and precision.This smokeless powder is really a