IMR 4064 Smokeless Powderimr 4064 is easily the most flexible propellant within the IMR line, useful for 223 Remington, 22-250 Remington, 220 Swift, 6mm Remington, 243 Winchester Super Limited Magnum, 308 Winchester, 338 Winchester Magnum, and also the listing goes on and on. Flexibility with uniformity and precision.This smokeless powder is actua