IMR 4064 Smokeless Powderimr 4064 is easily the most flexible propellant during the IMR line, used for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Tremendous Short Magnum, 308 Winchester, 338 Winchester Magnum, along with the listing goes on and on. Versatility with uniformity and precision.This smokeless powder can b